feat：架构重构

app/main.py

@@ -18,11 +18,7 @@ from app.core.logging import setup_logging
 async def lifespan(application: FastAPI):
     setup_logging()
     from app.clients.decision import close_decision_engine
-    from app.clients.material_mcp import (
-        MaterialFieldServiceError,
-        start_material_server,
-        stop_material_server,
-    )
+    from app.clients.mcp import start_mcp_servers, stop_mcp_servers
     from app.clients.user_center import close_user_center
     from app.observability.tracing import flush_tracing
     from app.processor.graph import build_graph
@@ -33,15 +29,12 @@ async def lifespan(application: FastAPI):
     # 按配置选择 MongoDB 或进程内存，会话记录与图检查点使用同一种存储
     persistence = await open_persistence()
     application.state.conversation_store = persistence.store
-    material_server = None
+    mcp_processes = []
     try:
-        # 物料目录启动时载入内存，agent 规划与前端接口共用，避免重复查询数据库
+        # 物料目录启动时载入内存，动作校验与前端接口共用，避免重复查询数据库
         await warm_material_cache(persistence.db)
-        # 物料字段服务给模型查询字段；启动失败只记录，需要查字段的修改执行时会报错
-        try:
-            material_server = await start_material_server()
-        except MaterialFieldServiceError as error:
-            logger.error("{}，修改组件属性和新增组件将无法执行", error)
+        # 拉起 mcp_servers.json 中由应用管理的服务；单个服务失败只记录，用到它的请求执行时报错
+        mcp_processes = await start_mcp_servers()
         application.state.agent_service = AgentService(
             build_graph(persistence.checkpointer), persistence.store
         )
@@ -49,7 +42,7 @@ async def lifespan(application: FastAPI):
     finally:
         # 共享客户端只在应用退出时关闭，追踪刷新放到线程避免阻塞事件循环
         try:
-            await stop_material_server(material_server)
+            await stop_mcp_servers(mcp_processes)
         finally:
             try:
                 await persistence.close()
@@ -65,6 +58,7 @@ async def lifespan(application: FastAPI):
                         finally:
                             await logger.complete()
 
+
 def create_app() -> FastAPI:
     application = FastAPI(title="Screen Agent API", lifespan=lifespan)
     # 统一处理请求校验、HTTP 错误和未捕获异常