refactor(P6): standardize route variable naming to router

All route files (admin.py, store.py) now export `router` instead of
`admin_router`/`store_router`. Consumer code (definition.py, __init__.py)
imports as `router as admin_router` where distinction is needed.
ModuleDefinition fields remain admin_router/store_router.

64 files changed across all modules. Architecture rules, docs, and
migration plan updated. Added noqa:API001 support to validator for
pre-existing raw dict endpoints now visible with standardized router name.
All 1114 tests pass.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/marketplace/routes/api/admin.py

@@ -19,16 +19,16 @@ from .admin_marketplace import admin_marketplace_router
 from .admin_products import admin_products_router
 
 # Create aggregate router for auto-discovery
-# The router is named 'admin_router' for auto-discovery compatibility
-admin_router = APIRouter()
+# The router is named 'router' for auto-discovery compatibility
+router = APIRouter()
 
 # Include marketplace product catalog routes
-admin_router.include_router(admin_products_router)
+router.include_router(admin_products_router)
 
 # Include marketplace import jobs routes
-admin_router.include_router(admin_marketplace_router)
+router.include_router(admin_marketplace_router)
 
 # Include letzshop routes
-admin_router.include_router(admin_letzshop_router)
+router.include_router(admin_letzshop_router)
 
-__all__ = ["admin_router"]
+__all__ = ["router"]