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/routes/api/admin.py

@@ -1,35 +0,0 @@
-# app/modules/dev_tools/routes/api/admin.py
-"""
-Dev-Tools Admin API Routes.
-
-Provides admin-only API endpoints for:
-- Code quality scanning (architecture, security, performance)
-- Violation management
-- Test execution
-
-Note: This currently re-exports routes from legacy locations.
-In future cleanup phases, the route implementations may be moved here.
-"""
-
-from fastapi import APIRouter
-
-# Import the existing routers from legacy locations
-from app.api.v1.admin.code_quality import router as code_quality_router
-from app.api.v1.admin.tests import router as tests_router
-
-# Create a combined admin router for the dev-tools module
-admin_router = APIRouter(prefix="/dev-tools", tags=["dev-tools"])
-
-# Include sub-routers
-admin_router.include_router(
-    code_quality_router,
-    prefix="/code-quality",
-    tags=["code-quality"],
-)
-admin_router.include_router(
-    tests_router,
-    prefix="/tests",
-    tags=["tests"],
-)
-
-__all__ = ["admin_router"]