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/dev_tools/tasks/code_quality.py

@@ -13,8 +13,8 @@ import subprocess
 from datetime import UTC, datetime
 
 from app.core.celery_config import celery_app
-from app.services.admin_notification_service import admin_notification_service
-from app.tasks.celery_tasks.base import DatabaseTask
+from app.modules.messaging.services.admin_notification_service import admin_notification_service
+from app.modules.task_base import ModuleTask
 from app.modules.dev_tools.models import ArchitectureScan, ArchitectureViolation
 
 logger = logging.getLogger(__name__)
@@ -59,7 +59,7 @@ def _get_git_commit_hash() -> str | None:
 
 @celery_app.task(
     bind=True,
-    base=DatabaseTask,
+    base=ModuleTask,
     name="app.modules.dev_tools.tasks.code_quality.execute_code_quality_scan",
     max_retries=1,
     time_limit=700,  # 11+ minutes hard limit