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/tenancy/static/admin/js/vendor-detail.js

@@ -21,6 +21,9 @@ function adminVendorDetail() {
 
         // Initialize
         async init() {
+            // Load i18n translations
+            await I18n.loadModule('tenancy');
+
             detailLog.info('=== VENDOR DETAIL PAGE INITIALIZING ===');
 
             // Prevent multiple initializations
@@ -45,7 +48,7 @@ function adminVendorDetail() {
             } else {
                 detailLog.error('No vendor code in URL');
                 this.error = 'Invalid vendor URL';
-                Utils.showToast('Invalid vendor URL', 'error');
+                Utils.showToast(I18n.t('tenancy.messages.invalid_vendor_url'), 'error');
             }
 
             detailLog.info('=== VENDOR DETAIL PAGE INITIALIZATION COMPLETE ===');
@@ -81,7 +84,7 @@ function adminVendorDetail() {
             } catch (error) {
                 window.LogConfig.logError(error, 'Load Vendor Details');
                 this.error = error.message || 'Failed to load vendor details';
-                Utils.showToast('Failed to load vendor details', 'error');
+                Utils.showToast(I18n.t('tenancy.messages.failed_to_load_vendor_details'), 'error');
             } finally {
                 this.loading = false;
             }
@@ -144,7 +147,7 @@ function adminVendorDetail() {
         // Create a new subscription for this vendor
         async createSubscription() {
             if (!this.vendor?.id) {
-                Utils.showToast('No vendor loaded', 'error');
+                Utils.showToast(I18n.t('tenancy.messages.no_vendor_loaded'), 'error');
                 return;
             }
 
@@ -165,7 +168,7 @@ function adminVendorDetail() {
                 window.LogConfig.logApiCall('POST', url, response, 'response');
 
                 this.subscription = response;
-                Utils.showToast('Subscription created successfully', 'success');
+                Utils.showToast(I18n.t('tenancy.messages.subscription_created_successfully'), 'success');
                 detailLog.info('Subscription created:', this.subscription);
 
             } catch (error) {
@@ -198,7 +201,7 @@ function adminVendorDetail() {
 
                 window.LogConfig.logApiCall('DELETE', url, null, 'response');
 
-                Utils.showToast('Vendor deleted successfully', 'success');
+                Utils.showToast(I18n.t('tenancy.messages.vendor_deleted_successfully'), 'success');
                 detailLog.info('Vendor deleted successfully');
 
                 // Redirect to vendors list
@@ -214,7 +217,7 @@ function adminVendorDetail() {
         async refresh() {
             detailLog.info('=== VENDOR REFRESH TRIGGERED ===');
             await this.loadVendor();
-            Utils.showToast('Vendor details refreshed', 'success');
+            Utils.showToast(I18n.t('tenancy.messages.vendor_details_refreshed'), 'success');
             detailLog.info('=== VENDOR REFRESH COMPLETE ===');
         }
     };