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-edit.js

@@ -21,6 +21,9 @@ function adminVendorEdit() {
 
         // Initialize
         async init() {
+            // Load i18n translations
+            await I18n.loadModule('tenancy');
+
             editLog.info('=== VENDOR EDIT PAGE INITIALIZING ===');
 
             // Prevent multiple initializations
@@ -41,14 +44,14 @@ function adminVendorEdit() {
                     await this.loadVendor();
                 } else {
                     editLog.error('No vendor code in URL');
-                    Utils.showToast('Invalid vendor URL', 'error');
+                    Utils.showToast(I18n.t('tenancy.messages.invalid_vendor_url'), 'error');
                     setTimeout(() => window.location.href = '/admin/vendors', 2000);
                 }
 
                 editLog.info('=== VENDOR EDIT PAGE INITIALIZATION COMPLETE ===');
             } catch (error) {
                 window.LogConfig.logError(error, 'Vendor Edit Init');
-                Utils.showToast('Failed to initialize page', 'error');
+                Utils.showToast(I18n.t('tenancy.messages.failed_to_initialize_page'), 'error');
             }
         },
 
@@ -96,7 +99,7 @@ function adminVendorEdit() {
 
             } catch (error) {
                 window.LogConfig.logError(error, 'Load Vendor');
-                Utils.showToast('Failed to load vendor', 'error');
+                Utils.showToast(I18n.t('tenancy.messages.failed_to_load_vendor'), 'error');
                 setTimeout(() => window.location.href = '/admin/vendors', 2000);
             } finally {
                 this.loadingVendor = false;
@@ -131,7 +134,7 @@ function adminVendorEdit() {
                 window.LogConfig.logPerformance('Update Vendor', duration);
 
                 this.vendor = response;
-                Utils.showToast('Vendor updated successfully', 'success');
+                Utils.showToast(I18n.t('tenancy.messages.vendor_updated_successfully'), 'success');
                 editLog.info(`Vendor updated successfully in ${duration}ms`, response);
 
                 // Optionally redirect back to list
@@ -249,7 +252,7 @@ function adminVendorEdit() {
 
                 window.LogConfig.logApiCall('DELETE', url, response, 'response');
 
-                Utils.showToast('Vendor deleted successfully', 'success');
+                Utils.showToast(I18n.t('tenancy.messages.vendor_deleted_successfully'), 'success');
                 editLog.info('Vendor deleted successfully');
 
                 // Redirect to vendors list
@@ -294,7 +297,7 @@ function adminVendorEdit() {
                 this.formData[field] = '';
             });
 
-            Utils.showToast('All contact fields reset to company defaults', 'info');
+            Utils.showToast(I18n.t('tenancy.messages.all_contact_fields_reset_to_company_defa'), 'info');
         },
 
         /**