Refactor Phase 2: Split stories.py into Schema/Service/Controller, add missing endpoints, fix async bug

backend/app/services/provider_router.py

@@ -177,7 +177,7 @@ def _build_config_from_provider(provider: "Provider") -> AdapterConfig:
     )
 
 
-def _get_providers_with_config(
+async def _get_providers_with_config(
     provider_type: ProviderType,
 ) -> list[tuple[str, AdapterConfig, "Provider | None"]]:
     """获取供应商列表及其配置。
@@ -185,7 +185,7 @@ def _get_providers_with_config(
     Returns:
         [(adapter_name, config, provider_or_none), ...] 按优先级排序
     """
-    db_providers = get_providers(provider_type)
+    db_providers = await get_providers(provider_type)
 
     if db_providers:
         return [(p.adapter, _build_config_from_provider(p), p) for p in db_providers]
@@ -265,7 +265,7 @@ async def _route_with_failover(
         user_id: 用户 ID（可选，用于成本追踪和预算检查）
         **kwargs: 传递给适配器的参数
     """
-    providers = _get_providers_with_config(provider_type)
+    providers = await _get_providers_with_config(provider_type)
 
     if not providers:
         raise ValueError(f"No {provider_type} providers configured.")