feat(17-04): menu plugin admin with registry types, URL checks and tree reorder

- golem15.menu plugin, tables golem15_menu_menus and golem15_menu_menu_entries with the PHP columns plus a nullable url_pattern (D-02)
- MenuEntry BeforeSave ports PHP beforeSave: nest columns 0, menu from the parent, sort_order after the menu's last
- entry type dropdown: url, divider and the signpost registry types; reference depends on type through signpost.ReferenceOptions
- URL scheme allowlist (errors.url_scheme), target _self or _blank, menu and parent cycle checks
- menu filter, toolbar reorder/create/delete and config_reorder.yaml partitioned by menu
- navigation Menus with Menus and Menu entries, permission golem15.menu.manage_menu, en and pl phrasebooks
- TestMenuAdminSmoke

models/menuentry/columns.yaml

@@ -0,0 +1,34 @@
+# ===================================
+#  List Column Definitions
+# ===================================
+
+columns:
+    id:
+        label: golem15.menu::lang.models.general.id
+        searchable: true
+    menu:
+        label: golem15.menu::lang.models.menuentry.menu
+        searchable: true
+        relation: menu
+        select: name
+    title:
+        label: golem15.menu::lang.models.menuentry.title
+        searchable: true
+    type:
+        label: golem15.menu::lang.models.menuentry.type
+        searchable: true
+    url:
+        label: golem15.menu::lang.models.menuentry.url
+        searchable: true
+    is_published:
+        label: golem15.menu::lang.models.menuentry.is_published
+        type: switch
+    created_at:
+        label: golem15.menu::lang.models.general.created_at
+        type: datetime
+        sortable: true
+        invisible: true
+    updated_at:
+        label: golem15.menu::lang.models.general.updated_at
+        type: datetime
+        sortable: true