feat: complete modular platform architecture (Phases 1-5)

Phase 1 - Vendor Router Integration:
- Wire up vendor module routers in app/api/v1/vendor/__init__.py
- Use lazy imports via __getattr__ to avoid circular dependencies

Phase 2 - Extract Remaining Modules:
- Create 6 new module directories: customers, cms, analytics, messaging,
  dev_tools, monitoring
- Each module has definition.py and route wrappers
- Update registry to import from extracted modules

Phase 3 - Database Table Migration:
- Add PlatformModule junction table for auditable module tracking
- Add migration zc2m3n4o5p6q7_add_platform_modules_table.py
- Add modules relationship to Platform model
- Update ModuleService with JSON-to-junction-table migration

Phase 4 - Module-Specific Configuration UI:
- Add /api/v1/admin/module-config/* endpoints
- Add module-config.html template and JS

Phase 5 - Integration Tests:
- Add tests/fixtures/module_fixtures.py
- Add tests/integration/api/v1/admin/test_modules.py
- Add tests/integration/api/v1/modules/test_module_access.py

Architecture fixes:
- Fix JS-003 errors: use ...data() directly in Alpine components
- Fix JS-005 warnings: add init() guards to prevent duplicate init
- Fix API-001 errors: add MenuActionResponse Pydantic model
- Add FE-008 noqa for dynamic number input in template

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

app/modules/marketplace/routes/__init__.py

@@ -4,9 +4,31 @@ Marketplace module route registration.
 
 This module provides functions to register marketplace routes
 with module-based access control.
+
+NOTE: Routers are NOT auto-imported to avoid circular dependencies.
+Import directly from admin.py or vendor.py as needed:
+  from app.modules.marketplace.routes.admin import admin_router, admin_letzshop_router
+  from app.modules.marketplace.routes.vendor import vendor_router, vendor_letzshop_router
 """
 
-from app.modules.marketplace.routes.admin import admin_router, admin_letzshop_router
-from app.modules.marketplace.routes.vendor import vendor_router, vendor_letzshop_router
+# Routers are imported on-demand to avoid circular dependencies
+# Do NOT add auto-imports here
 
 __all__ = ["admin_router", "admin_letzshop_router", "vendor_router", "vendor_letzshop_router"]
+
+
+def __getattr__(name: str):
+    """Lazy import routers to avoid circular dependencies."""
+    if name == "admin_router":
+        from app.modules.marketplace.routes.admin import admin_router
+        return admin_router
+    elif name == "admin_letzshop_router":
+        from app.modules.marketplace.routes.admin import admin_letzshop_router
+        return admin_letzshop_router
+    elif name == "vendor_router":
+        from app.modules.marketplace.routes.vendor import vendor_router
+        return vendor_router
+    elif name == "vendor_letzshop_router":
+        from app.modules.marketplace.routes.vendor import vendor_letzshop_router
+        return vendor_letzshop_router
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")

app/modules/marketplace/routes/admin.py

@@ -15,9 +15,9 @@ from fastapi import APIRouter, Depends
 
 from app.api.deps import require_module_access
 
-# Import original routers
-from app.api.v1.admin import marketplace as marketplace_routes
-from app.api.v1.admin import letzshop as letzshop_routes
+# Import original routers (direct import to avoid circular dependency)
+from app.api.v1.admin.marketplace import router as marketplace_original_router
+from app.api.v1.admin.letzshop import router as letzshop_original_router
 
 # Create module-aware router for marketplace
 admin_router = APIRouter(
@@ -26,7 +26,7 @@ admin_router = APIRouter(
 )
 
 # Re-export all routes from the original marketplace module
-for route in marketplace_routes.router.routes:
+for route in marketplace_original_router.routes:
     admin_router.routes.append(route)
 
 # Create separate router for letzshop integration
@@ -35,5 +35,5 @@ admin_letzshop_router = APIRouter(
     dependencies=[Depends(require_module_access("marketplace"))],
 )
 
-for route in letzshop_routes.router.routes:
+for route in letzshop_original_router.routes:
     admin_letzshop_router.routes.append(route)

app/modules/marketplace/routes/vendor.py

@@ -15,9 +15,9 @@ from fastapi import APIRouter, Depends
 
 from app.api.deps import require_module_access
 
-# Import original routers
-from app.api.v1.vendor import marketplace as marketplace_routes
-from app.api.v1.vendor import letzshop as letzshop_routes
+# Import original routers (direct import to avoid circular dependency)
+from app.api.v1.vendor.marketplace import router as marketplace_original_router
+from app.api.v1.vendor.letzshop import router as letzshop_original_router
 
 # Create module-aware router for marketplace
 vendor_router = APIRouter(
@@ -26,7 +26,7 @@ vendor_router = APIRouter(
 )
 
 # Re-export all routes from the original marketplace module
-for route in marketplace_routes.router.routes:
+for route in marketplace_original_router.routes:
     vendor_router.routes.append(route)
 
 # Create separate router for letzshop integration
@@ -35,5 +35,5 @@ vendor_letzshop_router = APIRouter(
     dependencies=[Depends(require_module_access("marketplace"))],
 )
 
-for route in letzshop_routes.router.routes:
+for route in letzshop_original_router.routes:
     vendor_letzshop_router.routes.append(route)