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/vendor/js/team.js

@@ -64,6 +64,9 @@ function vendorTeam() {
         ],
 
         async init() {
+            // Load i18n translations
+            await I18n.loadModule('tenancy');
+
             vendorTeamLog.info('Team init() called');
 
             // Guard against multiple initialization
@@ -149,7 +152,7 @@ function vendorTeam() {
          */
         async sendInvitation() {
             if (!this.inviteForm.email) {
-                Utils.showToast('Email is required', 'error');
+                Utils.showToast(I18n.t('tenancy.messages.email_is_required'), 'error');
                 return;
             }
 
@@ -157,7 +160,7 @@ function vendorTeam() {
             try {
                 await apiClient.post(`/vendor/team/invite`, this.inviteForm);
 
-                Utils.showToast('Invitation sent successfully', 'success');
+                Utils.showToast(I18n.t('tenancy.messages.invitation_sent_successfully'), 'success');
                 vendorTeamLog.info('Invitation sent to:', this.inviteForm.email);
 
                 this.showInviteModal = false;
@@ -195,7 +198,7 @@ function vendorTeam() {
                     this.editForm
                 );
 
-                Utils.showToast('Team member updated', 'success');
+                Utils.showToast(I18n.t('tenancy.messages.team_member_updated'), 'success');
                 vendorTeamLog.info('Updated team member:', this.selectedMember.user_id);
 
                 this.showEditModal = false;
@@ -227,7 +230,7 @@ function vendorTeam() {
             try {
                 await apiClient.delete(`/vendor/team/members/${this.selectedMember.user_id}`);
 
-                Utils.showToast('Team member removed', 'success');
+                Utils.showToast(I18n.t('tenancy.messages.team_member_removed'), 'success');
                 vendorTeamLog.info('Removed team member:', this.selectedMember.user_id);
 
                 this.showRemoveModal = false;