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/orders/static/admin/js/orders.js

@@ -135,6 +135,9 @@ function adminOrders() {
         },
 
         async init() {
+            // Load i18n translations
+            await I18n.loadModule('orders');
+
             adminOrdersLog.info('Orders init() called');
 
             // Guard against multiple initialization
@@ -392,7 +395,7 @@ function adminOrders() {
                 this.showDetailModal = true;
             } catch (error) {
                 adminOrdersLog.error('Failed to load order details:', error);
-                Utils.showToast('Failed to load order details.', 'error');
+                Utils.showToast(I18n.t('orders.messages.failed_to_load_order_details'), 'error');
             }
         },
 
@@ -436,7 +439,7 @@ function adminOrders() {
                 this.showStatusModal = false;
                 this.selectedOrder = null;
 
-                Utils.showToast('Order status updated successfully.', 'success');
+                Utils.showToast(I18n.t('orders.messages.order_status_updated_successfully'), 'success');
 
                 await this.refresh();
             } catch (error) {
@@ -487,7 +490,7 @@ function adminOrders() {
                 this.showMarkAsShippedModal = false;
                 this.selectedOrder = null;
 
-                Utils.showToast('Order marked as shipped successfully.', 'success');
+                Utils.showToast(I18n.t('orders.messages.order_marked_as_shipped_successfully'), 'success');
 
                 await this.refresh();
             } catch (error) {
@@ -509,7 +512,7 @@ function adminOrders() {
                     // Open label URL in new tab
                     window.open(labelInfo.label_url, '_blank');
                 } else {
-                    Utils.showToast('No shipping label URL available for this order.', 'warning');
+                    Utils.showToast(I18n.t('orders.messages.no_shipping_label_url_available_for_this'), 'warning');
                 }
             } catch (error) {
                 adminOrdersLog.error('Failed to get shipping label:', error);