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/cart/locales/en.json

@@ -30,6 +30,12 @@
     "max_quantity": "Maximum quantity is {max}",
     "insufficient_inventory": "Only {available} available"
   },
+  "permissions": {
+    "view": "View Carts",
+    "view_desc": "View customer shopping carts",
+    "manage": "Manage Carts",
+    "manage_desc": "Modify and manage customer carts"
+  },
   "messages": {
     "item_added": "Item added to cart",
     "item_updated": "Cart updated",