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/customers/locales/de.json

@@ -37,5 +37,15 @@
         "customers_section": "Kunden",
         "customers": "Kunden",
         "all_customers": "Alle Kunden"
+    },
+    "permissions": {
+        "customers_view": "Kunden anzeigen",
+        "customers_view_desc": "Kundenliste und Details anzeigen",
+        "customers_edit": "Kunden bearbeiten",
+        "customers_edit_desc": "Kundeninformationen ändern",
+        "customers_delete": "Kunden löschen",
+        "customers_delete_desc": "Kundendatensätze entfernen",
+        "customers_export": "Kunden exportieren",
+        "customers_export_desc": "Kundendaten exportieren"
     }
 }