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>

tests/integration/tasks/test_background_tasks.py

@@ -3,7 +3,7 @@ from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 
-from app.tasks.background_tasks import process_marketplace_import
+from app.modules.marketplace.tasks import process_marketplace_import
 from app.modules.marketplace.models import MarketplaceImportJob
 
 

tests/integration/tasks/test_letzshop_tasks.py

@@ -6,8 +6,8 @@ from unittest.mock import MagicMock, patch
 
 import pytest
 
-from app.services.letzshop import LetzshopClientError
-from app.tasks.letzshop_tasks import process_historical_import
+from app.modules.marketplace.services.letzshop import LetzshopClientError
+from app.modules.marketplace.tasks import process_historical_import
 from app.modules.marketplace.models import LetzshopHistoricalImportJob
 
 

tests/integration/tasks/test_subscription_tasks.py

@@ -6,7 +6,7 @@ from unittest.mock import MagicMock, PropertyMock, patch
 
 import pytest
 
-from app.tasks.subscription_tasks import (
+from app.modules.billing.tasks import (
     check_trial_expirations,
     cleanup_stale_subscriptions,
     reset_period_counters,