diff --git a/Cargo.lock b/Cargo.lock
index e00901ac..30f588d2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1884,10 +1884,8 @@ dependencies = [
  "chrono",
  "pagetop",
  "pagetop-seaorm",
- "sea-orm",
  "serde",
  "thiserror",
- "tokio",
 ]
 
 [[package]]
diff --git a/extensions/pagetop-menu/Cargo.toml b/extensions/pagetop-menu/Cargo.toml
new file mode 100644
index 00000000..bd8d676d
--- /dev/null
+++ b/extensions/pagetop-menu/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name        = "pagetop-menu"
+description = "Gestión centralizada y persistente de menús para PageTop."
+version     = "0.1.0"
+categories  = ["web-programming", "development-tools"]
+keywords    = ["pagetop", "menu", "navigation", "cms", "ssr"]
+
+repository.workspace   = true
+homepage.workspace     = true
+edition.workspace      = true
+license.workspace      = true
+authors.workspace      = true
+
+[dependencies]
+pagetop.workspace        = true
+pagetop-seaorm.workspace = true
+chrono.workspace         = true
+serde.workspace          = true
+thiserror.workspace      = true
diff --git a/extensions/pagetop-menu/src/action.rs b/extensions/pagetop-menu/src/action.rs
new file mode 100644
index 00000000..3dce5434
--- /dev/null
+++ b/extensions/pagetop-menu/src/action.rs
@@ -0,0 +1,312 @@
+//! Tipos de acción que `pagetop-menu` expone para que otras extensiones extiendan el sistema.
+//!
+//! El flujo de `build_tree()` despacha estas acciones en este orden:
+//!
+//! 1. `AlterMenuTree` - filtros, reordenamientos, inyección de nodos en caliente.
+//! 2. Cálculo del active trail por URL.
+//! 3. `ResolveActiveTrail` - matching personalizado para rutas paramétricas.
+//! 4. `DecorateMenuItem` - añadir atributos HTML a nodos individuales.
+//!
+//! El sembrado inicial usa `DeclareDefaultMenus` y `DeclareDefaultMenuItems`.
+
+use pagetop::prelude::*;
+
+use crate::repo::NewMenuItem;
+use crate::tree::{MenuNode, MenuTree};
+
+// **< Tipo de callbacks >**************************************************************************
+
+pub type FnMenuDefs = fn(&mut MenuDefs);
+pub type FnItemBag = fn(&mut ItemBag);
+pub type FnAlterTree = fn(&mut MenuTree, &Context);
+pub type FnDecorate = fn(&mut MenuNode, &Context);
+
+// **< MenuDefs >***********************************************************************************
+
+/// Bolsa de declaraciones de menú para `DeclareDefaultMenus`.
+pub struct MenuDefs {
+    pub(crate) entries: Vec<(String, String)>,
+}
+
+impl MenuDefs {
+    /// Declara que el menú `machine_name` debe existir con el título dado.
+    /// Si ya existe en la lista, no se añade de nuevo.
+    pub fn ensure(&mut self, machine_name: impl Into<String>, title: impl Into<String>) {
+        let name = machine_name.into();
+        if !self.entries.iter().any(|(n, _)| n == &name) {
+            self.entries.push((name, title.into()));
+        }
+    }
+}
+
+// **< ItemBag >************************************************************************************
+
+/// Bolsa de declaraciones de ítems para `DeclareDefaultMenuItems`.
+pub struct ItemBag {
+    pub(crate) items: Vec<NewMenuItem>,
+}
+
+impl ItemBag {
+    /// Añade un ítem declarado por código a la bolsa.
+    pub fn add(&mut self, item: NewMenuItem) {
+        self.items.push(item);
+    }
+}
+
+// **< DeclareDefaultMenus >************************************************************************
+
+/// Acción para declarar los menús que una extensión necesita.
+///
+/// Se despacha durante el sembrado inicial (`seed::run()`). El callback recibe un
+/// [`MenuDefs`] y puede llamar a `ensure()` para declarar los menús necesarios.
+///
+/// # Ejemplo
+///
+/// ```rust,no_run
+/// use pagetop_menu::action::{DeclareDefaultMenus, MenuDefs};
+///
+/// fn my_menus(defs: &mut MenuDefs) {
+///     defs.ensure("main", "Main navigation");
+///     defs.ensure("footer", "Footer links");
+/// }
+/// // En Extension::actions():
+/// // DeclareDefaultMenus::new(my_menus)
+/// ```
+pub struct DeclareDefaultMenus {
+    f: FnMenuDefs,
+    weight: Weight,
+}
+
+impl ActionDispatcher for DeclareDefaultMenus {
+    fn weight(&self) -> Weight {
+        self.weight
+    }
+}
+
+impl DeclareDefaultMenus {
+    pub fn new(f: FnMenuDefs) -> Self {
+        DeclareDefaultMenus { f, weight: 0 }
+    }
+
+    pub fn with_weight(mut self, w: Weight) -> Self {
+        self.weight = w;
+        self
+    }
+
+    pub(crate) fn dispatch(defs: &mut MenuDefs) {
+        dispatch_actions(
+            &ActionKey::new(UniqueId::of::<Self>(), None, None),
+            |action: &Self| (action.f)(defs),
+        );
+    }
+}
+
+// **< DeclareDefaultMenuItems >********************************************************************
+
+/// Acción para declarar los ítems por defecto de un menú concreto.
+///
+/// El `referer_id` es el `machine_name` del menú al que pertenecen los ítems.
+/// Se despacha durante el sembrado inicial (`seed::run()`) para cada menú conocido.
+///
+/// # Ejemplo
+///
+/// ```rust,no_run
+/// use pagetop_menu::action::{DeclareDefaultMenuItems, ItemBag};
+/// use pagetop_menu::NewMenuItem;
+///
+/// fn blog_items(bag: &mut ItemBag) {
+///     bag.add(NewMenuItem::new()
+///         .with_provider("my-blog")
+///         .with_external_key("blog.index")
+///         .with_title("Blog")
+///         .with_url("/blog")
+///         .with_weight(10));
+/// }
+/// // En Extension::actions():
+/// // DeclareDefaultMenuItems::new("main", blog_items)
+/// ```
+pub struct DeclareDefaultMenuItems {
+    menu_name: String,
+    f: FnItemBag,
+    weight: Weight,
+}
+
+impl ActionDispatcher for DeclareDefaultMenuItems {
+    fn referer_id(&self) -> Option<String> {
+        Some(self.menu_name.clone())
+    }
+
+    fn weight(&self) -> Weight {
+        self.weight
+    }
+}
+
+impl DeclareDefaultMenuItems {
+    pub fn new(menu_name: impl Into<String>, f: FnItemBag) -> Self {
+        DeclareDefaultMenuItems {
+            menu_name: menu_name.into(),
+            f,
+            weight: 0,
+        }
+    }
+
+    pub fn with_weight(mut self, w: Weight) -> Self {
+        self.weight = w;
+        self
+    }
+
+    pub(crate) fn dispatch(menu_name: &str, bag: &mut ItemBag) {
+        dispatch_actions(
+            &ActionKey::new(UniqueId::of::<Self>(), None, Some(menu_name.to_owned())),
+            |action: &Self| (action.f)(bag),
+        );
+    }
+}
+
+// **< AlterMenuTree >******************************************************************************
+
+/// Acción para modificar el árbol de un menú antes de calcularse el active trail.
+///
+/// El `referer_id` es el `machine_name` del menú. Las acciones con `referer_id` `None`
+/// no se registran aquí; usa un `machine_name` específico por menú.
+///
+/// Usos habituales: filtrar nodos por permisos, añadir nodos dinámicos, reordenar.
+///
+/// # Ejemplo
+///
+/// ```rust,no_run
+/// use pagetop_menu::action::AlterMenuTree;
+/// use pagetop_menu::tree::MenuTree;
+/// use pagetop::prelude::*;
+///
+/// fn hide_disabled(tree: &mut MenuTree, _cx: &Context) {
+///     tree.roots.retain(|n| n.enabled);
+/// }
+/// // En Extension::actions():
+/// // AlterMenuTree::new("main", hide_disabled)
+/// ```
+pub struct AlterMenuTree {
+    menu_name: String,
+    f: FnAlterTree,
+    weight: Weight,
+}
+
+impl ActionDispatcher for AlterMenuTree {
+    fn referer_id(&self) -> Option<String> {
+        Some(self.menu_name.clone())
+    }
+
+    fn weight(&self) -> Weight {
+        self.weight
+    }
+}
+
+impl AlterMenuTree {
+    pub fn new(menu_name: impl Into<String>, f: FnAlterTree) -> Self {
+        AlterMenuTree {
+            menu_name: menu_name.into(),
+            f,
+            weight: 0,
+        }
+    }
+
+    pub fn with_weight(mut self, w: Weight) -> Self {
+        self.weight = w;
+        self
+    }
+
+    pub(crate) fn dispatch(menu_name: &str, tree: &mut MenuTree, cx: &Context) {
+        dispatch_actions(
+            &ActionKey::new(UniqueId::of::<Self>(), None, Some(menu_name.to_owned())),
+            |action: &Self| (action.f)(tree, cx),
+        );
+    }
+}
+
+// **< ResolveActiveTrail >*************************************************************************
+
+/// Acción para resolver el active trail en casos que la coincidencia por URL no cubre.
+///
+/// Se despacha después del cálculo automático de active trail. Útil para rutas
+/// paramétricas (p. ej., `/blog/{slug}` que debe marcar activo al ítem `/blog`).
+pub struct ResolveActiveTrail {
+    menu_name: String,
+    f: FnAlterTree,
+    weight: Weight,
+}
+
+impl ActionDispatcher for ResolveActiveTrail {
+    fn referer_id(&self) -> Option<String> {
+        Some(self.menu_name.clone())
+    }
+
+    fn weight(&self) -> Weight {
+        self.weight
+    }
+}
+
+impl ResolveActiveTrail {
+    pub fn new(menu_name: impl Into<String>, f: FnAlterTree) -> Self {
+        ResolveActiveTrail {
+            menu_name: menu_name.into(),
+            f,
+            weight: 0,
+        }
+    }
+
+    pub fn with_weight(mut self, w: Weight) -> Self {
+        self.weight = w;
+        self
+    }
+
+    pub(crate) fn dispatch(menu_name: &str, tree: &mut MenuTree, cx: &Context) {
+        dispatch_actions(
+            &ActionKey::new(UniqueId::of::<Self>(), None, Some(menu_name.to_owned())),
+            |action: &Self| (action.f)(tree, cx),
+        );
+    }
+}
+
+// **< DecorateMenuItem >***************************************************************************
+
+/// Acción para decorar nodos individuales antes del render (atributos HTML, iconos, badges).
+///
+/// Se despacha para cada nodo del árbol después del cálculo del active trail,
+/// por lo que el callback puede leer `node.is_active` y `node.in_active_trail`.
+pub struct DecorateMenuItem {
+    menu_name: String,
+    f: FnDecorate,
+    weight: Weight,
+}
+
+impl ActionDispatcher for DecorateMenuItem {
+    fn referer_id(&self) -> Option<String> {
+        Some(self.menu_name.clone())
+    }
+
+    fn weight(&self) -> Weight {
+        self.weight
+    }
+}
+
+impl DecorateMenuItem {
+    pub fn new(menu_name: impl Into<String>, f: FnDecorate) -> Self {
+        DecorateMenuItem {
+            menu_name: menu_name.into(),
+            f,
+            weight: 0,
+        }
+    }
+
+    pub fn with_weight(mut self, w: Weight) -> Self {
+        self.weight = w;
+        self
+    }
+
+    pub(crate) fn dispatch(menu_name: &str, node: &mut MenuNode, cx: &Context) {
+        dispatch_actions(
+            &ActionKey::new(UniqueId::of::<Self>(), None, Some(menu_name.to_owned())),
+            |action: &Self| (action.f)(node, cx),
+        );
+    }
+}
diff --git a/extensions/pagetop-menu/src/cache.rs b/extensions/pagetop-menu/src/cache.rs
new file mode 100644
index 00000000..599c9c5f
--- /dev/null
+++ b/extensions/pagetop-menu/src/cache.rs
@@ -0,0 +1,73 @@
+//! Caché in-process de los ítems de menú por `machine_name`.
+//!
+//! Almacena la lista plana de modelos y sus traducciones para cada menú. El árbol se
+//! reconstruye en memoria en cada petición a partir de esta estructura. Hoy no existe ningún
+//! camino que escriba ítems tras el sembrado inicial (`seed::run()`, antes de la primera
+//! petición), así que no hace falta invalidación: cuando exista una vía de escritura en caliente
+//! (p. ej. una UI de administración), deberá invalidar la entrada correspondiente aquí.
+
+use std::collections::HashMap;
+use std::sync::LazyLock;
+use std::sync::{Arc, RwLock};
+
+use crate::entity::{menu_item, menu_item_translation};
+
+/// Contenido plano de un menú listo para construir el árbol.
+pub struct FlatMenu {
+    pub items: Vec<menu_item::Model>,
+    /// Traducciones indexadas por `item_id`.
+    pub translations: HashMap<i32, Vec<menu_item_translation::Model>>,
+}
+
+static CACHE: LazyLock<RwLock<HashMap<String, Arc<FlatMenu>>>> =
+    LazyLock::new(|| RwLock::new(HashMap::new()));
+
+/// Devuelve el contenido cacheado del menú dado, o lo carga desde BD si no está.
+pub async fn get_or_load(menu_id: i32, machine_name: &str) -> Arc<FlatMenu> {
+    {
+        let guard = CACHE.read().expect("cache read lock poisoned");
+        if let Some(flat) = guard.get(machine_name) {
+            return Arc::clone(flat);
+        }
+    }
+
+    let flat = load_from_db(menu_id).await;
+    let arc = Arc::new(flat);
+    CACHE
+        .write()
+        .expect("cache write lock poisoned")
+        .insert(machine_name.to_owned(), Arc::clone(&arc));
+    arc
+}
+
+async fn load_from_db(menu_id: i32) -> FlatMenu {
+    use pagetop_seaorm::db::{ColumnTrait, EntityTrait, QueryFilter, dbconn};
+
+    let items = menu_item::Entity::find()
+        .filter(menu_item::Column::MenuId.eq(menu_id))
+        .all(dbconn())
+        .await
+        .unwrap_or_default();
+
+    let item_ids: Vec<i32> = items.iter().map(|i| i.id).collect();
+
+    let all_translations = if item_ids.is_empty() {
+        vec![]
+    } else {
+        menu_item_translation::Entity::find()
+            .filter(menu_item_translation::Column::ItemId.is_in(item_ids))
+            .all(dbconn())
+            .await
+            .unwrap_or_default()
+    };
+
+    let mut translations: HashMap<i32, Vec<menu_item_translation::Model>> = HashMap::new();
+    for t in all_translations {
+        translations.entry(t.item_id).or_default().push(t);
+    }
+
+    FlatMenu {
+        items,
+        translations,
+    }
+}
diff --git a/extensions/pagetop-menu/src/component.rs b/extensions/pagetop-menu/src/component.rs
new file mode 100644
index 00000000..01804c2d
--- /dev/null
+++ b/extensions/pagetop-menu/src/component.rs
@@ -0,0 +1,7 @@
+//! Componentes de renderizado de menús.
+
+mod menu_block;
+mod menu_breadcrumb;
+
+pub use menu_block::MenuBlock;
+pub use menu_breadcrumb::MenuBreadcrumb;
diff --git a/extensions/pagetop-menu/src/component/menu_block.rs b/extensions/pagetop-menu/src/component/menu_block.rs
new file mode 100644
index 00000000..afcd79b4
--- /dev/null
+++ b/extensions/pagetop-menu/src/component/menu_block.rs
@@ -0,0 +1,198 @@
+use pagetop::prelude::*;
+
+use crate::tree::{MenuKey, MenuNode, TreeOptions, build_tree, try_resolve_menu_url};
+
+/// Renderiza un menú completo como bloque de navegación HTML.
+///
+/// Se construye componiendo [`Nav`] y [`nav::Item`] -- con [`Dropdown`]/[`dropdown::Item`] para
+/// los nodos con hijos -- a partir del árbol del menú, así que produce el mismo marcado accesible
+/// que cualquier `Nav`/`Dropdown` y se beneficia igual del CSS/JavaScript que aporta el tema
+/// activo:
+///
+/// ```html
+/// <nav aria-label="Main">
+///   <ul class="nav">
+///     <li class="nav-item"><a class="nav-link" aria-current="page" href="/">Home</a></li>
+///   </ul>
+/// </nav>
+/// ```
+///
+/// Los temas pueden sobreescribir el render con `handle_component()`, tanto de `MenuBlock` como,
+/// más generalmente, de [`Nav`]/[`nav::Item`]/[`Dropdown`]/[`dropdown::Item`]. `pagetop-bootsier`
+/// ya intercepta `Dropdown` así (ver `theme::bs::dropdown`), y por tanto también los que cuelguen
+/// de un `nav::Item::dropdown()`; `MenuBlock`, `Nav` y `Navbar` siguen sin interceptarse: Bootsier
+/// mantiene sus propios `bs::Navbar`/`bs::Nav`, sin relación con este componente.
+///
+/// # Limitaciones conocidas
+///
+/// - **Profundidad máxima de 2 niveles.** [`Dropdown`] no admite submenús anidados (como
+///   Bootstrap, del que toma su marcado): un nodo de tercer nivel o más profundo nunca se
+///   construye -- [`TreeOptions::max_depth`] se acota internamente a `2` con independencia de lo
+///   que indique [`with_max_depth()`](Self::with_max_depth), así que no hay pérdida silenciosa de
+///   datos, sencillamente no se piden a la base de datos.
+/// - **Sin colapso responsive propio.** A diferencia del antiguo `Menu::collapsible`, `Nav` es una
+///   lista plana sin botón ni JavaScript de colapso; una aplicación que necesite ese
+///   comportamiento debe envolver `MenuBlock` en su propia chrome hasta que exista un componente
+///   `Navbar` en el core.
+/// - `MenuNode::in_active_trail` y `MenuNode::expanded` (ver [`crate::tree::MenuNode`]) todavía no
+///   se reflejan en el marcado -- ni [`nav::Item`] ni [`dropdown::Item`] tienen hoy una forma
+///   verificada de pre-abrirse en el servidor sin que la mejora progresiva del tema
+///   (`accessible-menu` en `Basic`) lo sobrescriba al inicializarse. Sólo se traduce el estado
+///   `is_active`/`enabled` de cada nodo.
+///
+/// # Ejemplo
+///
+/// ```rust,no_run
+/// use pagetop::prelude::*;
+/// use pagetop_menu::component::MenuBlock;
+///
+/// async fn handler(request: HttpRequest) -> Result<Markup, ErrorPage> {
+///     Page::new(request)
+///         .with_child(MenuBlock::with("main"))
+///         .render().await
+/// }
+/// ```
+#[derive(AutoDefault, Clone, Debug)]
+pub struct MenuBlock {
+    menu_name: Option<String>,
+    show_title: bool,
+    max_depth: Option<u8>,
+    include_disabled: bool,
+    hide_when_empty: bool,
+}
+
+#[async_trait]
+impl Component for MenuBlock {
+    fn new() -> Self {
+        MenuBlock {
+            hide_when_empty: true,
+            ..Self::default()
+        }
+    }
+
+    async fn prepare(&self, cx: &mut Context) -> Result<Markup, ComponentError> {
+        let Some(name) = &self.menu_name else {
+            return Ok(html! {});
+        };
+
+        // `Dropdown` no admite submenús: nunca se piden más de 2 niveles al árbol.
+        let opts = TreeOptions {
+            max_depth: Some(self.max_depth.map(|d| d.min(2)).unwrap_or(2)),
+            include_disabled: self.include_disabled,
+        };
+
+        let Some(tree) = build_tree(MenuKey::Name(name.clone()), cx, &opts).await else {
+            return Ok(html! {});
+        };
+
+        if tree.roots.is_empty() && self.hide_when_empty {
+            return Ok(html! {});
+        }
+
+        let mut nav = Nav::new();
+        for node in &tree.roots {
+            nav = nav.with_item(node_to_item(node, cx));
+        }
+
+        let aria_label = (!tree.title.is_empty()).then_some(&tree.title);
+
+        Ok(html! {
+            @if self.show_title {
+                h2.menu-title { (&tree.title) }
+            }
+            nav aria-label=[aria_label] {
+                (nav.render(cx).await)
+            }
+        })
+    }
+}
+
+impl MenuBlock {
+    /// Crea un `MenuBlock` para el menú con el `machine_name` dado.
+    pub fn with(menu_name: impl Into<String>) -> Self {
+        let mut block = Self::new();
+        block.menu_name = Some(menu_name.into());
+        block
+    }
+
+    #[builder_fn]
+    pub fn with_show_title(mut self, v: impl Into<Option<bool>>) -> Self {
+        if let Some(v) = v.into() {
+            self.show_title = v;
+        }
+        self
+    }
+
+    /// Establece la profundidad máxima de nodos a incluir. El efectivo nunca supera `2`, por muy
+    /// alto que sea el valor indicado (ver "Limitaciones conocidas" en [`MenuBlock`]).
+    #[builder_fn]
+    pub fn with_max_depth(mut self, v: impl Into<Option<u8>>) -> Self {
+        self.max_depth = v.into();
+        self
+    }
+
+    #[builder_fn]
+    pub fn with_include_disabled(mut self, v: impl Into<Option<bool>>) -> Self {
+        if let Some(v) = v.into() {
+            self.include_disabled = v;
+        }
+        self
+    }
+
+    #[builder_fn]
+    pub fn with_hide_when_empty(mut self, v: impl Into<Option<bool>>) -> Self {
+        if let Some(v) = v.into() {
+            self.hide_when_empty = v;
+        }
+        self
+    }
+}
+
+// **< Traducción de MenuNode a nav::Item / dropdown::Item >****************************************
+
+// Convierte un `MenuNode` de nivel 1 (raíz) en un `nav::Item`: sin hijos, enlace (o etiqueta sin
+// ruta propia); con hijos, activador de un `Dropdown` con sus hijos como `dropdown::Item`. Los
+// hijos de un `MenuNode` de nivel 1 nunca tienen a su vez hijos propios -- `TreeOptions::max_depth`
+// se acota a 2 en `MenuBlock::prepare()`, así que no hay un tercer nivel que representar.
+fn node_to_item(node: &MenuNode, cx: &Context) -> nav::Item {
+    if !node.children.is_empty() {
+        let mut dropdown = Dropdown::new().with_title(Lc::n(node.title.clone()));
+        for child in &node.children {
+            dropdown = dropdown.with_item(child_to_item(child, cx));
+        }
+        return nav::Item::dropdown(dropdown);
+    }
+
+    let label = Lc::n(node.title.clone());
+    let is_external = node.url.as_ref().is_some_and(RoutePath::is_external);
+    let disabled = !node.enabled;
+
+    let Some(route) = try_resolve_menu_url(node.url.as_ref(), cx).map(Route::from) else {
+        return nav::Item::label(label);
+    };
+    match (is_external, disabled) {
+        (true, true) => nav::Item::link_blank_disabled(label, route),
+        (true, false) => nav::Item::link_blank(label, route),
+        (false, true) => nav::Item::link_disabled(label, route),
+        (false, false) => nav::Item::link(label, route),
+    }
+    .with_active(node.is_active)
+}
+
+// Convierte un `MenuNode` de nivel 2 en un `dropdown::Item`: sin ruta, etiqueta no interactiva; con
+// ruta, enlace. `Dropdown` no admite submenús, así que no hay recursión posible aquí.
+fn child_to_item(node: &MenuNode, cx: &Context) -> dropdown::Item {
+    let label = Lc::n(node.title.clone());
+    let is_external = node.url.as_ref().is_some_and(RoutePath::is_external);
+    let disabled = !node.enabled;
+
+    let Some(route) = try_resolve_menu_url(node.url.as_ref(), cx).map(Route::from) else {
+        return dropdown::Item::label(label);
+    };
+    match (is_external, disabled) {
+        (true, true) => dropdown::Item::link_blank_disabled(label, route),
+        (true, false) => dropdown::Item::link_blank(label, route),
+        (false, true) => dropdown::Item::link_disabled(label, route),
+        (false, false) => dropdown::Item::link(label, route),
+    }
+}
diff --git a/extensions/pagetop-menu/src/component/menu_breadcrumb.rs b/extensions/pagetop-menu/src/component/menu_breadcrumb.rs
new file mode 100644
index 00000000..9d9d95e2
--- /dev/null
+++ b/extensions/pagetop-menu/src/component/menu_breadcrumb.rs
@@ -0,0 +1,103 @@
+use pagetop::base::component::breadcrumb;
+use pagetop::prelude::*;
+
+use crate::tree::{MenuKey, MenuNode, TreeOptions, build_tree, try_resolve_menu_url};
+
+/// Migas de pan del menú dado, basándose en el active trail.
+///
+/// Resuelve el árbol del menú y su active trail (de forma asíncrona, en su propio
+/// [`prepare()`](Component::prepare)) y delega el renderizado en
+/// [`Breadcrumb`](pagetop::base::component::Breadcrumb): esta extensión sólo aporta los datos, la
+/// estructura HTML y las clases CSS son responsabilidad del componente base.
+///
+/// # Ejemplo
+///
+/// ```rust,no_run
+/// use pagetop::prelude::*;
+/// use pagetop_menu::component::MenuBreadcrumb;
+///
+/// async fn handler(request: HttpRequest) -> Result<Markup, ErrorPage> {
+///     Page::new(request)
+///         .with_child(MenuBreadcrumb::with("main"))
+///         .render().await
+/// }
+/// ```
+#[derive(AutoDefault, Clone, Debug)]
+pub struct MenuBreadcrumb {
+    menu_name: Option<String>,
+    include_current: bool,
+}
+
+#[async_trait]
+impl Component for MenuBreadcrumb {
+    fn new() -> Self {
+        MenuBreadcrumb {
+            include_current: true,
+            ..Self::default()
+        }
+    }
+
+    async fn prepare(&self, cx: &mut Context) -> Result<Markup, ComponentError> {
+        let Some(name) = &self.menu_name else {
+            return Ok(html! {});
+        };
+
+        let opts = TreeOptions::default();
+        let Some(tree) = build_tree(MenuKey::Name(name.clone()), cx, &opts).await else {
+            return Ok(html! {});
+        };
+
+        let path = extract_trail(&tree.roots);
+        if path.is_empty() {
+            return Ok(html! {});
+        }
+
+        let mut inner = Breadcrumb::new();
+        let last = path.len() - 1;
+        for (i, node) in path.iter().enumerate() {
+            let label = Lc::n(node.title.clone());
+            if i == last {
+                if self.include_current {
+                    inner = inner.with_crumb(breadcrumb::Crumb::current(label));
+                }
+            } else if let Some(url) = node.url.clone() {
+                let route =
+                    Route::with(move |cx| try_resolve_menu_url(Some(&url), cx).unwrap_or_default());
+                inner = inner.with_crumb(breadcrumb::Crumb::new(label, route));
+            } else {
+                inner = inner.with_crumb(breadcrumb::Crumb::text(label));
+            }
+        }
+
+        Ok(inner.render(cx).await)
+    }
+}
+
+impl MenuBreadcrumb {
+    /// Crea un `MenuBreadcrumb` para el menú con el `machine_name` dado.
+    pub fn with(menu_name: impl Into<String>) -> Self {
+        let mut bc = Self::new();
+        bc.menu_name = Some(menu_name.into());
+        bc
+    }
+
+    #[builder_fn]
+    pub fn with_include_current(mut self, v: impl Into<Option<bool>>) -> Self {
+        if let Some(v) = v.into() {
+            self.include_current = v;
+        }
+        self
+    }
+}
+
+// Extrae la cadena raíz -> nodo activo recorriendo el active trail.
+fn extract_trail(nodes: &[MenuNode]) -> Vec<&MenuNode> {
+    for node in nodes {
+        if node.in_active_trail || node.is_active {
+            let mut path = extract_trail(&node.children);
+            path.insert(0, node);
+            return path;
+        }
+    }
+    vec![]
+}
diff --git a/extensions/pagetop-menu/src/config.rs b/extensions/pagetop-menu/src/config.rs
new file mode 100644
index 00000000..27cae08e
--- /dev/null
+++ b/extensions/pagetop-menu/src/config.rs
@@ -0,0 +1,56 @@
+//! Configuración de `pagetop-menu`.
+//!
+//! Todos los valores pueden sobreescribirse en los ficheros TOML de la aplicación:
+//!
+//! ```toml
+//! [menu]
+//! default_menus = ["main", "footer", "user"]
+//! ```
+
+use pagetop::prelude::*;
+use serde::Deserialize;
+
+use std::sync::LazyLock;
+
+// **< CONFIG_MENU >********************************************************************************
+
+include_config!(CONFIG_MENU: MenuTopConfig => [
+    // Menús que se crean automáticamente si no los declara ninguna extensión.
+    // (Nota: los valores de lista no son soportados por config-rs vía set_default; se leen del
+    // TOML.)
+]);
+
+// **< MenuTopConfig >******************************************************************************
+
+/// Estructura raíz para la sección `[menu]` del fichero de configuración.
+#[derive(Clone, Debug, Deserialize)]
+pub struct MenuTopConfig {
+    pub menu: Settings,
+}
+
+// **< SETTINGS >***********************************************************************************
+
+/// Acceso directo a los ajustes de `pagetop-menu` (alias de `CONFIG_MENU.menu`).
+pub static SETTINGS: LazyLock<Settings> = LazyLock::new(|| CONFIG_MENU.menu.clone());
+
+// **< Settings >***********************************************************************************
+
+/// Ajustes de la extensión `pagetop-menu`, accesibles en la sección `[menu]` del TOML.
+#[derive(Clone, Debug, Deserialize)]
+pub struct Settings {
+    /// Menús que se aseguran en BD al arrancar si ninguna extensión los declara.
+    #[serde(default = "default_menus")]
+    pub default_menus: Vec<String>,
+}
+
+impl Default for Settings {
+    fn default() -> Self {
+        Settings {
+            default_menus: default_menus(),
+        }
+    }
+}
+
+fn default_menus() -> Vec<String> {
+    vec!["main".into(), "footer".into(), "user".into()]
+}
diff --git a/extensions/pagetop-menu/src/entity.rs b/extensions/pagetop-menu/src/entity.rs
new file mode 100644
index 00000000..3b01e834
--- /dev/null
+++ b/extensions/pagetop-menu/src/entity.rs
@@ -0,0 +1,6 @@
+//! Entidades SeaORM de `pagetop-menu`.
+
+pub mod menu;
+pub mod menu_item;
+pub mod menu_item_translation;
+pub mod menu_translation;
diff --git a/extensions/pagetop-menu/src/entity/menu.rs b/extensions/pagetop-menu/src/entity/menu.rs
new file mode 100644
index 00000000..3206e900
--- /dev/null
+++ b/extensions/pagetop-menu/src/entity/menu.rs
@@ -0,0 +1,37 @@
+use pagetop_seaorm::db::*;
+
+use chrono::NaiveDateTime;
+
+#[derive(Clone, Debug, DeriveEntityModel, PartialEq)]
+#[sea_orm(table_name = "menus")]
+pub struct Model {
+    #[sea_orm(primary_key)]
+    pub id: i32,
+    #[sea_orm(unique)]
+    pub machine_name: String,
+    pub locked: bool,
+    pub created_at: NaiveDateTime,
+    pub updated_at: NaiveDateTime,
+}
+
+#[derive(Clone, Copy, Debug, DeriveRelation, EnumIter)]
+pub enum Relation {
+    #[sea_orm(has_many = "super::menu_translation::Entity")]
+    MenuTranslations,
+    #[sea_orm(has_many = "super::menu_item::Entity")]
+    MenuItems,
+}
+
+impl Related<super::menu_translation::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::MenuTranslations.def()
+    }
+}
+
+impl Related<super::menu_item::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::MenuItems.def()
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}
diff --git a/extensions/pagetop-menu/src/entity/menu_item.rs b/extensions/pagetop-menu/src/entity/menu_item.rs
new file mode 100644
index 00000000..bcdc0238
--- /dev/null
+++ b/extensions/pagetop-menu/src/entity/menu_item.rs
@@ -0,0 +1,47 @@
+use pagetop_seaorm::db::*;
+
+use chrono::NaiveDateTime;
+
+#[derive(Clone, Debug, DeriveEntityModel, PartialEq)]
+#[sea_orm(table_name = "menu_items")]
+pub struct Model {
+    #[sea_orm(primary_key)]
+    pub id: i32,
+    pub menu_id: i32,
+    pub parent_id: Option<i32>,
+    pub url: String,
+    pub weight: i32,
+    pub enabled: bool,
+    pub expanded: bool,
+    pub provider: String,
+    pub external_key: Option<String>,
+    pub created_at: NaiveDateTime,
+    pub updated_at: NaiveDateTime,
+}
+
+#[derive(Clone, Copy, Debug, DeriveRelation, EnumIter)]
+pub enum Relation {
+    #[sea_orm(
+        belongs_to = "super::menu::Entity",
+        from = "Column::MenuId",
+        to = "super::menu::Column::Id",
+        on_delete = "Cascade"
+    )]
+    Menu,
+    #[sea_orm(has_many = "super::menu_item_translation::Entity")]
+    MenuItemTranslations,
+}
+
+impl Related<super::menu::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::Menu.def()
+    }
+}
+
+impl Related<super::menu_item_translation::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::MenuItemTranslations.def()
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}
diff --git a/extensions/pagetop-menu/src/entity/menu_item_translation.rs b/extensions/pagetop-menu/src/entity/menu_item_translation.rs
new file mode 100644
index 00000000..e8cae28c
--- /dev/null
+++ b/extensions/pagetop-menu/src/entity/menu_item_translation.rs
@@ -0,0 +1,30 @@
+use pagetop_seaorm::db::*;
+
+#[derive(Clone, Debug, DeriveEntityModel, PartialEq)]
+#[sea_orm(table_name = "menu_item_translations")]
+pub struct Model {
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub item_id: i32,
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub lang: String,
+    pub title: String,
+}
+
+#[derive(Clone, Copy, Debug, DeriveRelation, EnumIter)]
+pub enum Relation {
+    #[sea_orm(
+        belongs_to = "super::menu_item::Entity",
+        from = "Column::ItemId",
+        to = "super::menu_item::Column::Id",
+        on_delete = "Cascade"
+    )]
+    MenuItem,
+}
+
+impl Related<super::menu_item::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::MenuItem.def()
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}
diff --git a/extensions/pagetop-menu/src/entity/menu_translation.rs b/extensions/pagetop-menu/src/entity/menu_translation.rs
new file mode 100644
index 00000000..92b55e78
--- /dev/null
+++ b/extensions/pagetop-menu/src/entity/menu_translation.rs
@@ -0,0 +1,31 @@
+use pagetop_seaorm::db::*;
+
+#[derive(Clone, Debug, DeriveEntityModel, PartialEq)]
+#[sea_orm(table_name = "menu_translations")]
+pub struct Model {
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub menu_id: i32,
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub lang: String,
+    pub title: String,
+    pub description: Option<String>,
+}
+
+#[derive(Clone, Copy, Debug, DeriveRelation, EnumIter)]
+pub enum Relation {
+    #[sea_orm(
+        belongs_to = "super::menu::Entity",
+        from = "Column::MenuId",
+        to = "super::menu::Column::Id",
+        on_delete = "Cascade"
+    )]
+    Menu,
+}
+
+impl Related<super::menu::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::Menu.def()
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}
diff --git a/extensions/pagetop-menu/src/error.rs b/extensions/pagetop-menu/src/error.rs
new file mode 100644
index 00000000..5d32b086
--- /dev/null
+++ b/extensions/pagetop-menu/src/error.rs
@@ -0,0 +1,13 @@
+//! Tipos de error de `pagetop-menu`.
+
+use thiserror::Error;
+
+/// Errores que puede producir `pagetop-menu`.
+#[derive(Debug, Error)]
+pub enum MenuError {
+    #[error("invalid machine name: {0}")]
+    InvalidName(String),
+
+    #[error("database error: {0}")]
+    Database(#[from] pagetop_seaorm::db::DbErr),
+}
diff --git a/extensions/pagetop-menu/src/lib.rs b/extensions/pagetop-menu/src/lib.rs
new file mode 100644
index 00000000..9f88ee44
--- /dev/null
+++ b/extensions/pagetop-menu/src/lib.rs
@@ -0,0 +1,130 @@
+/*!
+<div align="center">
+
+<h1>PageTop Menu</h1>
+
+<p>Gestión centralizada y persistente de menús para <strong>PageTop</strong>.</p>
+
+</div>
+
+## Guía rápida
+
+Declara la dependencia en tu `Cargo.toml` y reenvía a `pagetop-seaorm` el motor de base de datos
+que vayas a usar:
+
+```toml
+[features]
+sqlite = ["pagetop-seaorm/sqlite"]
+
+[dependencies]
+pagetop-menu = { version = "..." }
+```
+
+Añade `&pagetop_menu::Menu` a las dependencias de tu extensión, declara los menús
+que necesitas y añade los componentes a tus páginas:
+
+```rust,no_run
+use pagetop::prelude::*;
+use pagetop_menu::prelude::*;
+
+pub struct MyApp;
+
+#[async_trait]
+impl Extension for MyApp {
+    fn dependencies(&self) -> Vec<ExtensionRef> {
+        vec![&pagetop_menu::Menu]
+    }
+
+    fn actions(&self) -> Vec<ActionBox> {
+        actions![
+            DeclareDefaultMenuItems::new("main", home_items),
+        ]
+    }
+
+    fn configure_router(&self, router: Router) -> Router {
+        router.route("/", web::get(home))
+    }
+}
+
+fn home_items(bag: &mut ItemBag) {
+    bag.add(NewMenuItem::new()
+        .with_provider("myapp")
+        .with_external_key("home")
+        .with_title("Home")
+        .with_url("/")
+        .with_weight(0));
+}
+
+async fn home(request: HttpRequest) -> Result<Markup, ErrorPage> {
+    Page::new(request)
+        .with_child(MenuBlock::with("main"))
+        .render().await
+}
+```
+*/
+
+use pagetop::prelude::*;
+use pagetop_seaorm::install_migrations;
+
+include_locales!(LOCALES_MENU);
+
+pub mod action;
+pub mod component;
+pub mod config;
+pub mod error;
+pub mod tree;
+
+pub(crate) mod cache;
+pub(crate) mod entity;
+pub(crate) mod migration;
+pub(crate) mod repo;
+pub(crate) mod seed;
+
+pub use action::{
+    AlterMenuTree, DeclareDefaultMenuItems, DeclareDefaultMenus, DecorateMenuItem, ItemBag,
+    MenuDefs, ResolveActiveTrail,
+};
+pub use repo::NewMenuItem;
+pub use tree::{MenuKey, MenuNode, MenuTree, TreeOptions, build_tree};
+
+/// Prelude de `pagetop-menu`.
+pub mod prelude {
+    pub use crate::action::{
+        AlterMenuTree, DeclareDefaultMenuItems, DeclareDefaultMenus, DecorateMenuItem, ItemBag,
+        MenuDefs, ResolveActiveTrail,
+    };
+    pub use crate::component::{MenuBlock, MenuBreadcrumb};
+    pub use crate::error::MenuError;
+    pub use crate::repo::NewMenuItem;
+    pub use crate::tree::{MenuKey, MenuNode, MenuTree, TreeOptions, build_tree};
+}
+
+// **< Extension >**********************************************************************************
+
+/// Implementa la extensión `pagetop-menu`.
+pub struct Menu;
+
+#[async_trait]
+impl Extension for Menu {
+    fn name(&self) -> Lc {
+        Lc::t("extension_name", &LOCALES_MENU)
+    }
+
+    fn description(&self) -> Lc {
+        Lc::t("extension_description", &LOCALES_MENU)
+    }
+
+    fn dependencies(&self) -> Vec<ExtensionRef> {
+        vec![&pagetop_seaorm::SeaORM]
+    }
+
+    async fn initialize(&self) {
+        install_migrations!(
+            m20260629_000001_create_menus,
+            m20260629_000002_create_menu_translations,
+            m20260629_000003_create_menu_items,
+            m20260629_000004_create_menu_item_translations,
+        );
+        seed::run().await;
+    }
+}
diff --git a/extensions/pagetop-menu/src/locale/en-US/common.ftl b/extensions/pagetop-menu/src/locale/en-US/common.ftl
new file mode 100644
index 00000000..b03c8282
--- /dev/null
+++ b/extensions/pagetop-menu/src/locale/en-US/common.ftl
@@ -0,0 +1,2 @@
+extension_name        = PageTop Menu
+extension_description = Centralized and persistent menu management for PageTop.
diff --git a/extensions/pagetop-menu/src/locale/es-ES/common.ftl b/extensions/pagetop-menu/src/locale/es-ES/common.ftl
new file mode 100644
index 00000000..81e96fa9
--- /dev/null
+++ b/extensions/pagetop-menu/src/locale/es-ES/common.ftl
@@ -0,0 +1,2 @@
+extension_name        = PageTop Menú
+extension_description = Gestión centralizada y persistente de menús para PageTop.
diff --git a/extensions/pagetop-menu/src/migration.rs b/extensions/pagetop-menu/src/migration.rs
new file mode 100644
index 00000000..fc0caa81
--- /dev/null
+++ b/extensions/pagetop-menu/src/migration.rs
@@ -0,0 +1,6 @@
+//! Migraciones de `pagetop-menu`.
+
+pub mod m20260629_000001_create_menus;
+pub mod m20260629_000002_create_menu_translations;
+pub mod m20260629_000003_create_menu_items;
+pub mod m20260629_000004_create_menu_item_translations;
diff --git a/extensions/pagetop-menu/src/migration/m20260629_000001_create_menus.rs b/extensions/pagetop-menu/src/migration/m20260629_000001_create_menus.rs
new file mode 100644
index 00000000..4d16a703
--- /dev/null
+++ b/extensions/pagetop-menu/src/migration/m20260629_000001_create_menus.rs
@@ -0,0 +1,32 @@
+use pagetop_seaorm::migration::*;
+
+pub struct Migration;
+
+#[pagetop::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .create_table(
+                table_auto(Menus::Table)
+                    .col(pk_auto(Menus::Id))
+                    .col(string_len_uniq(Menus::MachineName, 64))
+                    .col(boolean(Menus::Locked).default(false))
+                    .to_owned(),
+            )
+            .await
+    }
+
+    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .drop_table(Table::drop().table(Menus::Table).to_owned())
+            .await
+    }
+}
+
+#[derive(DeriveIden)]
+pub enum Menus {
+    Table,
+    Id,
+    MachineName,
+    Locked,
+}
diff --git a/extensions/pagetop-menu/src/migration/m20260629_000002_create_menu_translations.rs b/extensions/pagetop-menu/src/migration/m20260629_000002_create_menu_translations.rs
new file mode 100644
index 00000000..9fe5f045
--- /dev/null
+++ b/extensions/pagetop-menu/src/migration/m20260629_000002_create_menu_translations.rs
@@ -0,0 +1,58 @@
+use pagetop_seaorm::migration::*;
+
+pub struct Migration;
+
+#[pagetop::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .create_table(
+                Table::create()
+                    .table(MenuTranslations::Table)
+                    .if_not_exists()
+                    .col(integer(MenuTranslations::MenuId))
+                    .col(string_len(MenuTranslations::Lang, 35))
+                    .col(string_len(MenuTranslations::Title, 128))
+                    .col(text_null(MenuTranslations::Description))
+                    .primary_key(
+                        Index::create()
+                            .col(MenuTranslations::MenuId)
+                            .col(MenuTranslations::Lang),
+                    )
+                    .to_owned(),
+            )
+            .await?;
+
+        manager
+            .create_foreign_key(
+                ForeignKey::create()
+                    .name("fk_menu_translations_menu_id")
+                    .from(MenuTranslations::Table, MenuTranslations::MenuId)
+                    .to(Menus::Table, Menus::Id)
+                    .on_delete(ForeignKeyAction::Cascade)
+                    .to_owned(),
+            )
+            .await
+    }
+
+    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .drop_table(Table::drop().table(MenuTranslations::Table).to_owned())
+            .await
+    }
+}
+
+#[derive(DeriveIden)]
+enum MenuTranslations {
+    Table,
+    MenuId,
+    Lang,
+    Title,
+    Description,
+}
+
+#[derive(DeriveIden)]
+enum Menus {
+    Table,
+    Id,
+}
diff --git a/extensions/pagetop-menu/src/migration/m20260629_000003_create_menu_items.rs b/extensions/pagetop-menu/src/migration/m20260629_000003_create_menu_items.rs
new file mode 100644
index 00000000..52656a44
--- /dev/null
+++ b/extensions/pagetop-menu/src/migration/m20260629_000003_create_menu_items.rs
@@ -0,0 +1,87 @@
+use pagetop_seaorm::migration::*;
+
+pub struct Migration;
+
+#[pagetop::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .create_table(
+                table_auto(MenuItems::Table)
+                    .col(pk_auto(MenuItems::Id))
+                    .col(integer(MenuItems::MenuId))
+                    .col(integer_null(MenuItems::ParentId))
+                    .col(string_len(MenuItems::Url, 2048))
+                    .col(integer(MenuItems::Weight).default(0))
+                    .col(boolean(MenuItems::Enabled).default(true))
+                    .col(boolean(MenuItems::Expanded).default(false))
+                    .col(string_len(MenuItems::Provider, 64).default("user"))
+                    .col(string_len_null(MenuItems::ExternalKey, 128))
+                    .to_owned(),
+            )
+            .await?;
+
+        manager
+            .create_foreign_key(
+                ForeignKey::create()
+                    .name("fk_menu_items_menu_id")
+                    .from(MenuItems::Table, MenuItems::MenuId)
+                    .to(Menus::Table, Menus::Id)
+                    .on_delete(ForeignKeyAction::Cascade)
+                    .to_owned(),
+            )
+            .await?;
+
+        // Índice para listar hijos ordenados.
+        manager
+            .create_index(
+                Index::create()
+                    .name("idx_menu_items_menu_parent_weight")
+                    .table(MenuItems::Table)
+                    .col(MenuItems::MenuId)
+                    .col(MenuItems::ParentId)
+                    .col(MenuItems::Weight)
+                    .to_owned(),
+            )
+            .await?;
+
+        // Índice de unicidad para upserts por extensión.
+        manager
+            .create_index(
+                Index::create()
+                    .name("idx_menu_items_provider_key")
+                    .table(MenuItems::Table)
+                    .col(MenuItems::Provider)
+                    .col(MenuItems::ExternalKey)
+                    .unique()
+                    .to_owned(),
+            )
+            .await
+    }
+
+    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .drop_table(Table::drop().table(MenuItems::Table).to_owned())
+            .await
+    }
+}
+
+#[derive(DeriveIden)]
+pub enum MenuItems {
+    Table,
+    Id,
+    MenuId,
+    ParentId,
+    Url,
+    Weight,
+    Enabled,
+    Expanded,
+    Provider,
+    ExternalKey,
+}
+
+#[derive(DeriveIden)]
+enum Menus {
+    Table,
+    Id,
+}
diff --git a/extensions/pagetop-menu/src/migration/m20260629_000004_create_menu_item_translations.rs b/extensions/pagetop-menu/src/migration/m20260629_000004_create_menu_item_translations.rs
new file mode 100644
index 00000000..2d883ead
--- /dev/null
+++ b/extensions/pagetop-menu/src/migration/m20260629_000004_create_menu_item_translations.rs
@@ -0,0 +1,56 @@
+use pagetop_seaorm::migration::*;
+
+pub struct Migration;
+
+#[pagetop::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .create_table(
+                Table::create()
+                    .table(MenuItemTranslations::Table)
+                    .if_not_exists()
+                    .col(integer(MenuItemTranslations::ItemId))
+                    .col(string_len(MenuItemTranslations::Lang, 35))
+                    .col(string_len(MenuItemTranslations::Title, 255))
+                    .primary_key(
+                        Index::create()
+                            .col(MenuItemTranslations::ItemId)
+                            .col(MenuItemTranslations::Lang),
+                    )
+                    .to_owned(),
+            )
+            .await?;
+
+        manager
+            .create_foreign_key(
+                ForeignKey::create()
+                    .name("fk_menu_item_translations_item_id")
+                    .from(MenuItemTranslations::Table, MenuItemTranslations::ItemId)
+                    .to(MenuItems::Table, MenuItems::Id)
+                    .on_delete(ForeignKeyAction::Cascade)
+                    .to_owned(),
+            )
+            .await
+    }
+
+    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .drop_table(Table::drop().table(MenuItemTranslations::Table).to_owned())
+            .await
+    }
+}
+
+#[derive(DeriveIden)]
+enum MenuItemTranslations {
+    Table,
+    ItemId,
+    Lang,
+    Title,
+}
+
+#[derive(DeriveIden)]
+enum MenuItems {
+    Table,
+    Id,
+}
diff --git a/extensions/pagetop-menu/src/repo.rs b/extensions/pagetop-menu/src/repo.rs
new file mode 100644
index 00000000..4db2cea5
--- /dev/null
+++ b/extensions/pagetop-menu/src/repo.rs
@@ -0,0 +1,309 @@
+//! Operaciones de base de datos para menús e ítems de menú.
+
+use chrono::Utc;
+
+use pagetop::locale::Locale;
+use pagetop_seaorm::db::{
+    ActiveModelTrait, ActiveValue::NotSet, ColumnTrait, EntityTrait, QueryFilter, Set, dbconn,
+};
+
+use crate::entity::{menu, menu_item, menu_item_translation, menu_translation};
+use crate::error::MenuError;
+use crate::tree::MenuKey;
+
+// **< Tipos de entrada >***************************************************************************
+
+/// Datos necesarios para crear un nuevo menú.
+pub struct NewMenu {
+    pub machine_name: String,
+    /// Títulos por idioma: `(lang, title)`. Al menos uno es obligatorio.
+    pub titles: Vec<(String, String)>,
+    pub locked: bool,
+}
+
+/// Datos de un ítem nuevo o para hacer upsert.
+pub struct NewMenuItem {
+    pub parent_key: Option<String>,
+    /// Títulos por idioma: `(lang, title)`. Al menos uno es obligatorio.
+    pub titles: Vec<(String, String)>,
+    pub url: String,
+    pub weight: i32,
+    pub enabled: bool,
+    pub expanded: bool,
+    pub provider: String,
+    pub external_key: Option<String>,
+}
+
+impl NewMenuItem {
+    pub fn new() -> Self {
+        NewMenuItem {
+            parent_key: None,
+            titles: Vec::new(),
+            url: String::new(),
+            weight: 0,
+            enabled: true,
+            expanded: false,
+            provider: "user".into(),
+            external_key: None,
+        }
+    }
+
+    /// Añade el título en el idioma por defecto de la aplicación.
+    pub fn with_title(mut self, title: impl Into<String>) -> Self {
+        let lang = Locale::default_langid().to_string();
+        self.titles.push((lang, title.into()));
+        self
+    }
+
+    /// Añade el título en el idioma indicado.
+    pub fn with_title_for(mut self, lang: impl Into<String>, title: impl Into<String>) -> Self {
+        self.titles.push((lang.into(), title.into()));
+        self
+    }
+
+    pub fn with_url(mut self, u: impl Into<String>) -> Self {
+        self.url = u.into();
+        self
+    }
+
+    pub fn with_weight(mut self, w: i32) -> Self {
+        self.weight = w;
+        self
+    }
+
+    pub fn with_enabled(mut self, v: bool) -> Self {
+        self.enabled = v;
+        self
+    }
+
+    pub fn with_expanded(mut self, v: bool) -> Self {
+        self.expanded = v;
+        self
+    }
+
+    pub fn with_provider(mut self, p: impl Into<String>) -> Self {
+        self.provider = p.into();
+        self
+    }
+
+    pub fn with_external_key(mut self, k: impl Into<String>) -> Self {
+        self.external_key = Some(k.into());
+        self
+    }
+
+    pub fn with_parent_key(mut self, k: impl Into<String>) -> Self {
+        self.parent_key = Some(k.into());
+        self
+    }
+}
+
+impl Default for NewMenuItem {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+// **< find_menu_model >****************************************************************************
+
+/// Devuelve el modelo de BD del menú dado, o `None` si no existe.
+pub async fn find_menu_model(key: &MenuKey) -> Option<menu::Model> {
+    match key {
+        MenuKey::Id(id) => menu::Entity::find_by_id(*id).one(dbconn()).await.ok()?,
+        MenuKey::Name(n) => menu::Entity::find()
+            .filter(menu::Column::MachineName.eq(n.as_str()))
+            .one(dbconn())
+            .await
+            .ok()?,
+    }
+}
+
+// **< create_menu >********************************************************************************
+
+/// Crea un nuevo menú en la base de datos con sus traducciones iniciales.
+pub async fn create_menu(input: NewMenu) -> Result<menu::Model, MenuError> {
+    if input.machine_name.is_empty()
+        || !input
+            .machine_name
+            .chars()
+            .all(|c| c.is_ascii_alphanumeric() || c == '_')
+    {
+        return Err(MenuError::InvalidName(input.machine_name));
+    }
+
+    let now = Utc::now().naive_utc();
+    let result = menu::Entity::insert(menu::ActiveModel {
+        id: NotSet,
+        machine_name: Set(input.machine_name),
+        locked: Set(input.locked),
+        created_at: Set(now),
+        updated_at: Set(now),
+    })
+    .exec_with_returning(dbconn())
+    .await?;
+
+    for (lang, title) in input.titles {
+        upsert_menu_translation(result.id, &lang, &title, None).await?;
+    }
+
+    Ok(result)
+}
+
+/// Crea un menú sólo si no existe ya uno con el mismo `machine_name`, y sincroniza
+/// la traducción del título en el idioma por defecto.
+pub async fn ensure_menu(machine_name: &str, title: &str) -> Result<(), MenuError> {
+    let lang = Locale::default_langid().to_string();
+
+    let existing = find_menu_model(&MenuKey::Name(machine_name.to_owned())).await;
+
+    let menu_id = if let Some(m) = existing {
+        m.id
+    } else {
+        create_menu(NewMenu {
+            machine_name: machine_name.to_owned(),
+            titles: vec![(lang.clone(), title.to_owned())],
+            locked: false,
+        })
+        .await?
+        .id
+    };
+
+    upsert_menu_translation(menu_id, &lang, title, None).await?;
+
+    Ok(())
+}
+
+// **< upsert_item >********************************************************************************
+
+/// Inserta o actualiza un ítem identificado por `(provider, external_key)`.
+///
+/// Si el ítem ya existe, actualiza `url`, `weight` y `parent_id`; los campos `enabled`
+/// y `expanded` modificados por el administrador no se sobreescriben. Las traducciones
+/// se sincronizan para los idiomas incluidos en `input.titles`.
+pub async fn upsert_item(
+    menu_id: i32,
+    provider: &str,
+    external_key: &str,
+    input: NewMenuItem,
+) -> Result<(), MenuError> {
+    let existing = menu_item::Entity::find()
+        .filter(menu_item::Column::Provider.eq(provider))
+        .filter(menu_item::Column::ExternalKey.eq(external_key))
+        .one(dbconn())
+        .await?;
+
+    let parent_id = resolve_parent_id(menu_id, &input.parent_key).await;
+    let now = Utc::now().naive_utc();
+
+    let item_id = if let Some(row) = existing {
+        menu_item::ActiveModel {
+            id: Set(row.id),
+            url: Set(input.url),
+            weight: Set(input.weight),
+            parent_id: Set(parent_id),
+            updated_at: Set(now),
+            ..Default::default()
+        }
+        .update(dbconn())
+        .await?;
+        row.id
+    } else {
+        menu_item::Entity::insert(menu_item::ActiveModel {
+            id: NotSet,
+            menu_id: Set(menu_id),
+            parent_id: Set(parent_id),
+            url: Set(input.url),
+            weight: Set(input.weight),
+            enabled: Set(input.enabled),
+            expanded: Set(input.expanded),
+            provider: Set(provider.to_owned()),
+            external_key: Set(Some(external_key.to_owned())),
+            created_at: Set(now),
+            updated_at: Set(now),
+        })
+        .exec_with_returning(dbconn())
+        .await?
+        .id
+    };
+
+    for (lang, title) in input.titles {
+        upsert_item_translation(item_id, &lang, &title).await?;
+    }
+
+    Ok(())
+}
+
+// **< Funciones internas >*************************************************************************
+
+async fn resolve_parent_id(menu_id: i32, parent_key: &Option<String>) -> Option<i32> {
+    let key = parent_key.as_deref()?;
+    let row = menu_item::Entity::find()
+        .filter(menu_item::Column::MenuId.eq(menu_id))
+        .filter(menu_item::Column::ExternalKey.eq(key))
+        .one(dbconn())
+        .await
+        .ok()??;
+    Some(row.id)
+}
+
+async fn upsert_menu_translation(
+    menu_id: i32,
+    lang: &str,
+    title: &str,
+    description: Option<&str>,
+) -> Result<(), MenuError> {
+    let existing = menu_translation::Entity::find()
+        .filter(menu_translation::Column::MenuId.eq(menu_id))
+        .filter(menu_translation::Column::Lang.eq(lang))
+        .one(dbconn())
+        .await?;
+
+    if existing.is_some() {
+        menu_translation::ActiveModel {
+            menu_id: Set(menu_id),
+            lang: Set(lang.to_owned()),
+            title: Set(title.to_owned()),
+            description: Set(description.map(str::to_owned)),
+        }
+        .update(dbconn())
+        .await?;
+    } else {
+        menu_translation::Entity::insert(menu_translation::ActiveModel {
+            menu_id: Set(menu_id),
+            lang: Set(lang.to_owned()),
+            title: Set(title.to_owned()),
+            description: Set(description.map(str::to_owned)),
+        })
+        .exec(dbconn())
+        .await?;
+    }
+
+    Ok(())
+}
+
+async fn upsert_item_translation(item_id: i32, lang: &str, title: &str) -> Result<(), MenuError> {
+    let existing = menu_item_translation::Entity::find()
+        .filter(menu_item_translation::Column::ItemId.eq(item_id))
+        .filter(menu_item_translation::Column::Lang.eq(lang))
+        .one(dbconn())
+        .await?;
+
+    if existing.is_some() {
+        menu_item_translation::ActiveModel {
+            item_id: Set(item_id),
+            lang: Set(lang.to_owned()),
+            title: Set(title.to_owned()),
+        }
+        .update(dbconn())
+        .await?;
+    } else {
+        menu_item_translation::Entity::insert(menu_item_translation::ActiveModel {
+            item_id: Set(item_id),
+            lang: Set(lang.to_owned()),
+            title: Set(title.to_owned()),
+        })
+        .exec(dbconn())
+        .await?;
+    }
+
+    Ok(())
+}
diff --git a/extensions/pagetop-menu/src/seed.rs b/extensions/pagetop-menu/src/seed.rs
new file mode 100644
index 00000000..0ee30b5e
--- /dev/null
+++ b/extensions/pagetop-menu/src/seed.rs
@@ -0,0 +1,60 @@
+//! Sembrado inicial de menús e ítems declarados por extensiones.
+//!
+//! Se invoca desde `Extension::initialize()` después de aplicar las migraciones.
+//! Es idempotente: puede ejecutarse en cada arranque sin duplicar datos.
+
+use crate::action::{DeclareDefaultMenuItems, DeclareDefaultMenus, ItemBag, MenuDefs};
+use crate::config::SETTINGS;
+use crate::repo;
+
+/// Ejecuta el sembrado completo:
+///
+/// 1. Recoge los menús declarados por extensiones vía `DeclareDefaultMenus`.
+/// 2. Asegura que los menús configurados en `menu.default_menus` también existen.
+/// 3. Para cada menú conocido, recoge y aplica los ítems declarados por extensiones.
+pub(crate) async fn run() {
+    // Paso 1: recoger declaraciones de menú.
+    let mut defs = MenuDefs {
+        entries: Vec::new(),
+    };
+    DeclareDefaultMenus::dispatch(&mut defs);
+
+    // Paso 2: añadir los menús por defecto de configuración si no se declararon ya.
+    for name in &SETTINGS.default_menus {
+        if !defs.entries.iter().any(|(n, _)| n == name) {
+            let title = capitalize(name);
+            defs.entries.push((name.clone(), title));
+        }
+    }
+
+    // Paso 3: crear cada menú que no exista y sembrar sus ítems.
+    for (machine_name, title) in &defs.entries {
+        repo::ensure_menu(machine_name, title).await.ok();
+
+        let Some(menu_id) =
+            repo::find_menu_model(&crate::tree::MenuKey::Name(machine_name.to_owned()))
+                .await
+                .map(|m| m.id)
+        else {
+            continue;
+        };
+
+        let mut bag = ItemBag { items: Vec::new() };
+        DeclareDefaultMenuItems::dispatch(machine_name, &mut bag);
+
+        for item in bag.items {
+            if let Some(key) = item.external_key.clone() {
+                let provider = item.provider.clone();
+                repo::upsert_item(menu_id, &provider, &key, item).await.ok();
+            }
+        }
+    }
+}
+
+fn capitalize(s: &str) -> String {
+    let mut c = s.chars();
+    match c.next() {
+        None => String::new(),
+        Some(f) => f.to_uppercase().to_string() + c.as_str(),
+    }
+}
diff --git a/extensions/pagetop-menu/src/tree.rs b/extensions/pagetop-menu/src/tree.rs
new file mode 100644
index 00000000..0df23a53
--- /dev/null
+++ b/extensions/pagetop-menu/src/tree.rs
@@ -0,0 +1,289 @@
+//! Tipos en memoria del árbol de menús y función de construcción.
+
+use std::collections::HashMap;
+
+use pagetop::locale::{Locale, RequestLocale};
+use pagetop::prelude::*;
+
+use crate::cache::FlatMenu;
+use crate::entity::menu_item_translation;
+use crate::{action, cache, repo};
+
+// **< MenuKey >************************************************************************************
+
+/// Selector para localizar un menú por `id` o por `machine_name`.
+pub enum MenuKey {
+    Id(i32),
+    Name(String),
+}
+
+impl From<i32> for MenuKey {
+    fn from(id: i32) -> Self {
+        MenuKey::Id(id)
+    }
+}
+
+impl From<&str> for MenuKey {
+    fn from(name: &str) -> Self {
+        MenuKey::Name(name.to_owned())
+    }
+}
+
+impl From<String> for MenuKey {
+    fn from(name: String) -> Self {
+        MenuKey::Name(name)
+    }
+}
+
+// **< URL de un ítem de menú >*********************************************************************
+
+/// Construye la URL de un ítem de menú a partir del texto crudo guardado en BD.
+///
+/// Devuelve `None` para `<nolink>` o una cadena vacía (título de sección, sin enlace). El
+/// `RoutePath` devuelto está sin resolver todavía: [`try_resolve_menu_url()`] es quien decide, en
+/// el momento del renderizado, si debe pasar por [`Context::route()`] o dejarse tal cual.
+pub fn menu_item_url(url: &str) -> Option<RoutePath> {
+    (!url.is_empty() && url != "<nolink>").then(|| RoutePath::new(url.to_owned()))
+}
+
+/// Resuelve la URL de un ítem de menú para renderizado.
+///
+/// Las internas pasan por [`Context::route()`] para preservar `lang` cuando corresponda; las
+/// externas ([`RoutePath::is_external()`]) se devuelven tal cual, sin tocar el idioma, porque no
+/// pertenecen al espacio de rutas de la aplicación. `None` (sin enlace) se propaga tal cual.
+pub fn try_resolve_menu_url(url: Option<&RoutePath>, cx: &Context) -> Option<RoutePath> {
+    url.map(|path| {
+        if path.is_external() {
+            path.clone()
+        } else {
+            cx.route(path.path().to_owned())
+        }
+    })
+}
+
+// **< TreeOptions >********************************************************************************
+
+/// Opciones de construcción del árbol de menú.
+#[derive(Clone, Debug, Default)]
+pub struct TreeOptions {
+    /// Profundidad máxima de nodos a incluir (`None` = sin límite).
+    pub max_depth: Option<u8>,
+    /// Si `true`, incluye también los ítems con `enabled = false`.
+    pub include_disabled: bool,
+}
+
+// **< MenuNode >***********************************************************************************
+
+/// Nodo del árbol de menú. Sus campos son `pub` para que las acciones puedan modificarlos.
+#[derive(Clone, Debug)]
+pub struct MenuNode {
+    pub item_id: i32,
+    pub title: String,
+    /// `None` si el ítem no tiene enlace (`<nolink>` o URL vacía): título de sección.
+    pub url: Option<RoutePath>,
+    pub weight: i32,
+    pub depth: u8,
+    pub enabled: bool,
+    pub expanded: bool,
+    pub provider: String,
+    pub external_key: Option<String>,
+    /// Atributos HTML adicionales inyectados por `DecorateMenuItem` en tiempo de render.
+    pub attrs: HashMap<String, String>,
+    pub children: Vec<MenuNode>,
+    /// `true` si este nodo o algún descendiente coincide con la ruta actual.
+    pub in_active_trail: bool,
+    /// `true` si este nodo coincide exactamente con la ruta actual.
+    pub is_active: bool,
+}
+
+// **< MenuTree >***********************************************************************************
+
+/// Árbol completo de un menú, listo para renderizar.
+#[derive(Clone, Debug)]
+pub struct MenuTree {
+    pub menu_id: i32,
+    pub machine_name: String,
+    pub title: String,
+    pub roots: Vec<MenuNode>,
+}
+
+impl MenuTree {
+    /// Aplica `f` recursivamente a todos los nodos del árbol (post-orden).
+    pub fn walk_mut<F: FnMut(&mut MenuNode)>(&mut self, f: &mut F) {
+        walk_nodes_mut(&mut self.roots, f);
+    }
+}
+
+fn walk_nodes_mut<F: FnMut(&mut MenuNode)>(nodes: &mut [MenuNode], f: &mut F) {
+    for node in nodes.iter_mut() {
+        walk_nodes_mut(&mut node.children, f);
+        f(node);
+    }
+}
+
+// **< build_tree >*********************************************************************************
+
+/// Construye el árbol del menú indicado aplicando caché, acciones y active trail.
+///
+/// Devuelve `None` si el menú no existe en la base de datos.
+pub async fn build_tree(key: MenuKey, cx: &Context, opts: &TreeOptions) -> Option<MenuTree> {
+    let menu = repo::find_menu_model(&key).await?;
+
+    let flat = cache::get_or_load(menu.id, &menu.machine_name).await;
+
+    let lang = RequestLocale::from_request(cx.request())
+        .langid()
+        .to_string();
+
+    let menu_title = resolve_menu_title(menu.id, &lang).await;
+
+    let roots = build_nodes(&flat, None, 1, opts, &lang);
+
+    let mut tree = MenuTree {
+        menu_id: menu.id,
+        machine_name: menu.machine_name.clone(),
+        title: menu_title,
+        roots,
+    };
+
+    // Acciones de alteración del árbol (filtros, reordenamientos, etc.).
+    action::AlterMenuTree::dispatch(&menu.machine_name, &mut tree, cx);
+
+    // Cálculo del active trail por coincidencia de URL.
+    let current_path = cx.request().map(|r| r.path()).unwrap_or("/");
+    compute_active_trail(&mut tree.roots, current_path);
+
+    // Acciones de resolución de active trail para rutas paramétricas o especiales.
+    action::ResolveActiveTrail::dispatch(&menu.machine_name, &mut tree, cx);
+
+    // Decoración de nodos (atributos HTML, iconos, badges...).
+    let name = menu.machine_name.clone();
+    tree.walk_mut(&mut |node| {
+        action::DecorateMenuItem::dispatch(&name, node, cx);
+    });
+
+    Some(tree)
+}
+
+// **< Funciones internas >*************************************************************************
+
+pub(crate) fn build_nodes(
+    flat: &FlatMenu,
+    parent_id: Option<i32>,
+    depth: u8,
+    opts: &TreeOptions,
+    lang: &str,
+) -> Vec<MenuNode> {
+    if opts.max_depth.map(|d| depth > d).unwrap_or(false) {
+        return vec![];
+    }
+
+    let mut nodes: Vec<MenuNode> = flat
+        .items
+        .iter()
+        .filter(|m| m.parent_id == parent_id && (opts.include_disabled || m.enabled))
+        .map(|m| {
+            let translations = flat
+                .translations
+                .get(&m.id)
+                .map(Vec::as_slice)
+                .unwrap_or(&[]);
+            MenuNode {
+                item_id: m.id,
+                title: resolve_item_title(translations, lang),
+                url: menu_item_url(&m.url),
+                weight: m.weight,
+                depth,
+                enabled: m.enabled,
+                expanded: m.expanded,
+                provider: m.provider.clone(),
+                external_key: m.external_key.clone(),
+                attrs: HashMap::new(),
+                children: build_nodes(flat, Some(m.id), depth + 1, opts, lang),
+                in_active_trail: false,
+                is_active: false,
+            }
+        })
+        .collect();
+
+    nodes.sort_by_key(|n| n.weight);
+    nodes
+}
+
+pub(crate) fn compute_active_trail(nodes: &mut [MenuNode], current_path: &str) -> bool {
+    let mut any_active = false;
+    for node in nodes.iter_mut() {
+        let self_active = node
+            .url
+            .as_ref()
+            .is_some_and(|p| !p.is_external() && p.path() == current_path);
+        let child_active = compute_active_trail(&mut node.children, current_path);
+        node.is_active = self_active;
+        node.in_active_trail = self_active || child_active;
+        if node.in_active_trail {
+            any_active = true;
+        }
+    }
+    any_active
+}
+
+// Resuelve el título del menú desde la BD aplicando la cadena de fallback de idioma.
+async fn resolve_menu_title(menu_id: i32, lang: &str) -> String {
+    use crate::entity::menu_translation;
+    use pagetop_seaorm::db::{ColumnTrait, EntityTrait, QueryFilter, dbconn};
+
+    let rows = menu_translation::Entity::find()
+        .filter(menu_translation::Column::MenuId.eq(menu_id))
+        .all(dbconn())
+        .await
+        .unwrap_or_default();
+
+    resolve_title_from(
+        rows.iter().map(|r| (r.lang.as_str(), r.title.as_str())),
+        lang,
+    )
+}
+
+// Resuelve el título de un ítem aplicando la cadena de fallback de idioma.
+fn resolve_item_title(translations: &[menu_item_translation::Model], lang: &str) -> String {
+    resolve_title_from(
+        translations
+            .iter()
+            .map(|t| (t.lang.as_str(), t.title.as_str())),
+        lang,
+    )
+}
+
+// Cadena de fallback: exacto -> base del lang -> idioma por defecto -> base del defecto ->
+// cualquiera.
+fn resolve_title_from<'a>(
+    translations: impl Iterator<Item = (&'a str, &'a str)> + Clone,
+    lang: &str,
+) -> String {
+    let base_lang = lang.split('-').next().unwrap_or(lang);
+    let default_lang = Locale::default_langid().to_string();
+    let base_default = default_lang.split('-').next().unwrap_or("").to_owned();
+
+    let candidates = [
+        lang,
+        base_lang,
+        default_lang.as_str(),
+        base_default.as_str(),
+    ];
+
+    for candidate in candidates {
+        if candidate.is_empty() {
+            continue;
+        }
+        if let Some((_, title)) = translations.clone().find(|(l, _)| *l == candidate) {
+            return title.to_owned();
+        }
+    }
+
+    // Cualquier traducción disponible como último recurso.
+    translations
+        .clone()
+        .next()
+        .map(|(_, t)| t.to_owned())
+        .unwrap_or_default()
+}