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/cms/definition.py

@@ -12,8 +12,8 @@ This is a self-contained module with:
 - Templates: app.modules.cms.templates (namespaced as cms/)
 """
 
-from app.modules.base import ModuleDefinition
-from models.database.admin_menu_config import FrontendType
+from app.modules.base import MenuItemDefinition, MenuSectionDefinition, ModuleDefinition
+from app.modules.enums import FrontendType
 
 
 def _get_admin_router():
@@ -53,6 +53,57 @@ cms_module = ModuleDefinition(
             "media",  # Media library
         ],
     },
+    # New module-driven menu definitions
+    menus={
+        FrontendType.ADMIN: [
+            MenuSectionDefinition(
+                id="contentMgmt",
+                label_key="cms.menu.content_management",
+                icon="document-text",
+                order=70,
+                items=[
+                    MenuItemDefinition(
+                        id="content-pages",
+                        label_key="cms.menu.content_pages",
+                        icon="document-text",
+                        route="/admin/content-pages",
+                        order=20,
+                    ),
+                    MenuItemDefinition(
+                        id="vendor-themes",
+                        label_key="cms.menu.vendor_themes",
+                        icon="color-swatch",
+                        route="/admin/vendor-themes",
+                        order=30,
+                    ),
+                ],
+            ),
+        ],
+        FrontendType.VENDOR: [
+            MenuSectionDefinition(
+                id="shop",
+                label_key="cms.menu.shop_content",
+                icon="document-text",
+                order=40,
+                items=[
+                    MenuItemDefinition(
+                        id="content-pages",
+                        label_key="cms.menu.content_pages",
+                        icon="document-text",
+                        route="/vendor/{vendor_code}/content-pages",
+                        order=10,
+                    ),
+                    MenuItemDefinition(
+                        id="media",
+                        label_key="cms.menu.media_library",
+                        icon="photograph",
+                        route="/vendor/{vendor_code}/media",
+                        order=20,
+                    ),
+                ],
+            ),
+        ],
+    },
     is_core=True,  # CMS is a core module - content management is fundamental
     # Self-contained module configuration
     is_self_contained=True,