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/monitoring/services/admin_audit_service.py

@@ -15,9 +15,9 @@ from sqlalchemy import and_
 from sqlalchemy.orm import Session
 
 from app.modules.tenancy.exceptions import AdminOperationException
-from models.database.admin import AdminAuditLog
-from models.database.user import User
-from models.schema.admin import AdminAuditLogFilters, AdminAuditLogResponse
+from app.modules.tenancy.models import AdminAuditLog
+from app.modules.tenancy.models import User
+from app.modules.tenancy.schemas.admin import AdminAuditLogFilters, AdminAuditLogResponse
 
 logger = logging.getLogger(__name__)
 

app/modules/monitoring/services/log_service.py

@@ -20,8 +20,8 @@ from sqlalchemy.orm import Session
 from app.core.config import settings
 from app.exceptions import ResourceNotFoundException
 from app.modules.tenancy.exceptions import AdminOperationException
-from models.database.admin import ApplicationLog
-from models.schema.admin import (
+from app.modules.tenancy.models import ApplicationLog
+from app.modules.tenancy.schemas.admin import (
     ApplicationLogFilters,
     ApplicationLogListResponse,
     ApplicationLogResponse,

app/modules/monitoring/services/platform_health_service.py

@@ -20,7 +20,7 @@ from app.modules.core.services.image_service import image_service
 from app.modules.inventory.models import Inventory
 from app.modules.orders.models import Order
 from app.modules.catalog.models import Product
-from models.database.vendor import Vendor
+from app.modules.tenancy.models import Vendor
 
 logger = logging.getLogger(__name__)
 
@@ -173,7 +173,7 @@ class PlatformHealthService:
         Returns aggregated limits and current usage for capacity planning.
         """
         from app.modules.billing.models import VendorSubscription
-        from models.database.vendor import VendorUser
+        from app.modules.tenancy.models import VendorUser
 
         # Get all active subscriptions with their limits
         subscriptions = (