feat(roles): add admin store roles page, permission i18n, and menu integration

- Add admin store roles page with merchant→store cascading for superadmin
  and store-only selection for platform admin
- Add permission catalog API with translated labels/descriptions (en/fr/de/lb)
- Add permission translations to all 15 module locale files (60 files total)
- Add info icon tooltips for permission descriptions in role editor
- Add store roles menu item and admin menu item in module definition
- Fix store-selector.js URL construction bug when apiEndpoint has query params
- Add admin store roles API (CRUD + platform scoping)
- Add integration tests for admin store roles and permission catalog

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/core/locales/de.json

@@ -76,5 +76,17 @@
         "account_settings": "Kontoeinstellungen",
         "profile": "Profil",
         "settings": "Einstellungen"
+    },
+    "permissions": {
+        "dashboard_view": "Dashboard anzeigen",
+        "dashboard_view_desc": "Zugriff auf das Dashboard und die Übersicht",
+        "settings_view": "Einstellungen anzeigen",
+        "settings_view_desc": "Shop-Konfiguration anzeigen",
+        "settings_edit": "Einstellungen bearbeiten",
+        "settings_edit_desc": "Shop-Konfiguration ändern",
+        "settings_theme": "Theme verwalten",
+        "settings_theme_desc": "Shop-Theme und Erscheinungsbild anpassen",
+        "settings_domains": "Domains verwalten",
+        "settings_domains_desc": "Benutzerdefinierte Domains konfigurieren"
     }
 }