refactor: migrate templates and static files to self-contained modules

Templates Migration:
- Migrate admin templates to modules (tenancy, billing, monitoring, marketplace, etc.)
- Migrate vendor templates to modules (tenancy, billing, orders, messaging, etc.)
- Migrate storefront templates to modules (catalog, customers, orders, cart, checkout, cms)
- Migrate public templates to modules (billing, marketplace, cms)
- Keep shared templates in app/templates/ (base.html, errors/, partials/, macros/)
- Migrate letzshop partials to marketplace module

Static Files Migration:
- Migrate admin JS to modules: tenancy (23 files), core (5 files), monitoring (1 file)
- Migrate vendor JS to modules: tenancy (4 files), core (2 files)
- Migrate shared JS: vendor-selector.js to core, media-picker.js to cms
- Migrate storefront JS: storefront-layout.js to core
- Keep framework JS in static/ (api-client, utils, money, icons, log-config, lib/)
- Update all template references to use module_static paths

Naming Consistency:
- Rename static/platform/ to static/public/
- Rename app/templates/platform/ to app/templates/public/
- Update all extends and static references

Documentation:
- Update module-system.md with shared templates documentation
- Update frontend-structure.md with new module JS organization

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/modules/tenancy/services/__init__.py

@@ -3,11 +3,64 @@
 Tenancy module services.
 
 Business logic for platform, company, vendor, and admin user management.
-Currently services remain in app/services/ - this package is a placeholder
-for future migration.
+
+Services:
+- vendor_service: Vendor operations and product catalog
+- admin_service: Admin user and vendor management
+- admin_platform_service: Admin-platform assignments
+- vendor_team_service: Team member management
+- vendor_domain_service: Custom domain management
+- company_service: Company CRUD operations
+- platform_service: Platform operations
+- team_service: Team operations
 """
 
-# Services will be migrated here from app/services/
-# For now, import from legacy location if needed:
-# from app.services.vendor_service import vendor_service
-# from app.services.company_service import company_service
+from app.modules.tenancy.services.admin_platform_service import (
+    AdminPlatformService,
+    admin_platform_service,
+)
+from app.modules.tenancy.services.admin_service import AdminService, admin_service
+from app.modules.tenancy.services.company_service import CompanyService, company_service
+from app.modules.tenancy.services.platform_service import (
+    PlatformService,
+    PlatformStats,
+    platform_service,
+)
+from app.modules.tenancy.services.team_service import TeamService, team_service
+from app.modules.tenancy.services.vendor_domain_service import (
+    VendorDomainService,
+    vendor_domain_service,
+)
+from app.modules.tenancy.services.vendor_service import VendorService, vendor_service
+from app.modules.tenancy.services.vendor_team_service import (
+    VendorTeamService,
+    vendor_team_service,
+)
+
+__all__ = [
+    # Vendor
+    "VendorService",
+    "vendor_service",
+    # Admin
+    "AdminService",
+    "admin_service",
+    # Admin Platform
+    "AdminPlatformService",
+    "admin_platform_service",
+    # Vendor Team
+    "VendorTeamService",
+    "vendor_team_service",
+    # Vendor Domain
+    "VendorDomainService",
+    "vendor_domain_service",
+    # Company
+    "CompanyService",
+    "company_service",
+    # Platform
+    "PlatformService",
+    "PlatformStats",
+    "platform_service",
+    # Team
+    "TeamService",
+    "team_service",
+]