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/schemas/__init__.py

@@ -35,6 +35,44 @@ from app.modules.cms.schemas.homepage_sections import (
     HomepageSectionsResponse,
 )
 
+# Media schemas
+from app.modules.cms.schemas.media import (
+    FailedFileInfo,
+    MediaDetailResponse,
+    MediaItemResponse,
+    MediaListResponse,
+    MediaMetadataUpdate,
+    MediaUploadResponse,
+    MediaUsageResponse,
+    MessageResponse,
+    MultipleUploadResponse,
+    OptimizationResultResponse,
+    ProductUsageInfo,
+    UploadedFileInfo,
+)
+
+# Image schemas
+from app.modules.cms.schemas.image import (
+    ImageDeleteResponse,
+    ImageStorageStats,
+    ImageUploadResponse,
+    ImageUrls,
+)
+
+# Theme schemas
+from app.modules.cms.schemas.vendor_theme import (
+    ThemeDeleteResponse,
+    ThemePresetListResponse,
+    ThemePresetPreview,
+    ThemePresetResponse,
+    VendorThemeBranding,
+    VendorThemeColors,
+    VendorThemeFonts,
+    VendorThemeLayout,
+    VendorThemeResponse,
+    VendorThemeUpdate,
+)
+
 __all__ = [
     # Content Page - Admin
     "ContentPageCreate",
@@ -60,4 +98,33 @@ __all__ = [
     "HomepageSections",
     "SectionUpdateRequest",
     "HomepageSectionsResponse",
+    # Media
+    "FailedFileInfo",
+    "MediaDetailResponse",
+    "MediaItemResponse",
+    "MediaListResponse",
+    "MediaMetadataUpdate",
+    "MediaUploadResponse",
+    "MediaUsageResponse",
+    "MessageResponse",
+    "MultipleUploadResponse",
+    "OptimizationResultResponse",
+    "ProductUsageInfo",
+    "UploadedFileInfo",
+    # Image
+    "ImageDeleteResponse",
+    "ImageStorageStats",
+    "ImageUploadResponse",
+    "ImageUrls",
+    # Theme
+    "ThemeDeleteResponse",
+    "ThemePresetListResponse",
+    "ThemePresetPreview",
+    "ThemePresetResponse",
+    "VendorThemeBranding",
+    "VendorThemeColors",
+    "VendorThemeFonts",
+    "VendorThemeLayout",
+    "VendorThemeResponse",
+    "VendorThemeUpdate",
 ]