feat(backend): add customer-service dict list and ensure-on-write helpers.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/api/__init__.py

@@ -42,6 +42,7 @@ from app.api.mini_auth import router as mini_auth_router
 from app.api.mini_menu import router as mini_menu_router
 from app.api.market_mobile import router as market_mobile_router
 from app.api.sample_storage_cert_qc import router as sample_storage_cert_qc_router
+from app.api.customer_service_dict import router as customer_service_dict_router
 
 __all__ = [
     "public_router",
@@ -87,4 +88,5 @@ __all__ = [
     "mini_menu_router",
     "market_mobile_router",
     "sample_storage_cert_qc_router",
+    "customer_service_dict_router",
 ]