refactor: complete module-driven architecture migration

This commit completes the migration to a fully module-driven architecture:

## Models Migration
- Moved all domain models from models/database/ to their respective modules:
  - tenancy: User, Admin, Vendor, Company, Platform, VendorDomain, etc.
  - cms: MediaFile, VendorTheme
  - messaging: Email, VendorEmailSettings, VendorEmailTemplate
  - core: AdminMenuConfig
- models/database/ now only contains Base and TimestampMixin (infrastructure)

## Schemas Migration
- Moved all domain schemas from models/schema/ to their respective modules:
  - tenancy: company, vendor, admin, team, vendor_domain
  - cms: media, image, vendor_theme
  - messaging: email
- models/schema/ now only contains base.py and auth.py (infrastructure)

## Routes Migration
- Moved admin routes from app/api/v1/admin/ to modules:
  - menu_config.py -> core module
  - modules.py -> tenancy module
  - module_config.py -> tenancy module
- app/api/v1/admin/ now only aggregates auto-discovered module routes

## Menu System
- Implemented module-driven menu system with MenuDiscoveryService
- Extended FrontendType enum: PLATFORM, ADMIN, VENDOR, STOREFRONT
- Added MenuItemDefinition and MenuSectionDefinition dataclasses
- Each module now defines its own menu items in definition.py
- MenuService integrates with MenuDiscoveryService for template rendering

## Documentation
- Updated docs/architecture/models-structure.md
- Updated docs/architecture/menu-management.md
- Updated architecture validation rules for new exceptions

## Architecture Validation
- Updated MOD-019 rule to allow base.py in models/schema/
- Created core module exceptions.py and schemas/ directory
- All validation errors resolved (only warnings remain)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/modules/checkout/locales/fr.json

@@ -1,42 +1,20 @@
 {
-  "title": "Caisse",
-  "description": "Traitement des commandes et des paiements",
-  "session": {
-    "title": "Session de paiement",
-    "expired": "Session expirée",
-    "invalid": "Session invalide"
-  },
-  "shipping": {
-    "title": "Adresse de livraison",
-    "select_address": "Sélectionner une adresse",
-    "add_new": "Ajouter une nouvelle adresse",
-    "method": "Mode de livraison",
-    "select_method": "Sélectionner un mode de livraison",
-    "not_available": "Non disponible pour cette adresse"
-  },
-  "payment": {
-    "title": "Paiement",
-    "method": "Mode de paiement",
-    "required": "Paiement requis",
-    "failed": "Paiement échoué"
-  },
-  "order": {
-    "summary": "Récapitulatif de commande",
-    "subtotal": "Sous-total",
-    "shipping": "Livraison",
-    "tax": "TVA",
-    "total": "Total",
-    "place_order": "Passer la commande"
-  },
-  "validation": {
-    "empty_cart": "Le panier est vide",
-    "invalid_address": "Adresse de livraison invalide",
-    "insufficient_inventory": "Stock insuffisant"
-  },
-  "messages": {
+  "storefront": {
+    "welcome": "Bienvenue dans notre boutique",
+    "browse_products": "Parcourir les produits",
+    "add_to_cart": "Ajouter au panier",
+    "buy_now": "Acheter maintenant",
+    "view_cart": "Voir le panier",
+    "checkout": "Paiement",
+    "continue_shopping": "Continuer vos achats",
+    "start_shopping": "Commencer vos achats",
+    "empty_cart": "Votre panier est vide",
+    "cart_total": "Total du panier",
+    "proceed_checkout": "Passer à la caisse",
+    "payment": "Paiement",
+    "place_order": "Passer la commande",
     "order_placed": "Commande passée avec succès",
-    "checkout_failed": "Échec du paiement",
-    "session_expired": "Votre session a expiré",
-    "inventory_error": "Certains articles ne sont plus disponibles"
+    "thank_you": "Merci pour votre commande",
+    "order_confirmation": "Confirmation de commande"
   }
 }