fix(utils/lifespan): 添加适配器关闭逻辑

在FastAPI生命周期的关闭阶段调用shutdown_adapters来清理外部适配器资源

backend/server/utils/lifespan.py

@@ -9,7 +9,7 @@ from yuxi.agents.mcp.service import ensure_builtin_mcp_servers_in_db
 from yuxi.models.providers.service import ensure_builtin_model_providers_in_db
 from yuxi.services.run_queue_service import close_queue_clients, get_redis_client
 from yuxi.storage.postgres.manager import pg_manager
-from yuxi.external import register_adapters
+from yuxi.external_system import register_adapters, shutdown_adapters
 from yuxi.knowledge import knowledge_base
 from yuxi.utils import logger
 from yuxi.agents.backends.sandbox import init_sandbox_provider, shutdown_sandbox_provider
@@ -126,6 +126,7 @@ async def lifespan(app: FastAPI):
     logger.info("Yuxi backend startup complete")
     yield
     await tasker.shutdown()
+    await shutdown_adapters()
     shutdown_sandbox_provider()
     await close_queue_clients()
     await pg_manager.close()