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/menu/columns.yaml

@@ -0,0 +1,26 @@
+# ===================================
+#  List Column Definitions
+# ===================================
+
+columns:
+    id:
+        label: golem15.menu::lang.models.general.id
+        searchable: true
+    name:
+        label: golem15.menu::lang.models.menu.name
+        searchable: true
+    code:
+        label: golem15.menu::lang.models.menu.code
+        searchable: true
+    is_active:
+        label: golem15.menu::lang.models.menu.is_active
+        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

models/menu/fields.yaml

@@ -0,0 +1,25 @@
+# ===================================
+#  Form Field Definitions
+# ===================================
+
+fields:
+    name:
+        label: golem15.menu::lang.models.menu.name
+        type: text
+        span: left
+        required: true
+    code:
+        label: golem15.menu::lang.models.menu.code
+        type: text
+        span: right
+        required: true
+        preset: name
+    css_class:
+        label: golem15.menu::lang.models.menu.css_class
+        type: text
+        span: left
+    is_active:
+        label: golem15.menu::lang.models.menu.is_active
+        type: switch
+        span: right
+        default: true