feat：接入mcp，为模型提供图表信息

app/main.py

@@ -18,6 +18,11 @@ 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.user_center import close_user_center
     from app.observability.tracing import flush_tracing
     from app.processor.graph import build_graph
@@ -28,9 +33,15 @@ 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
     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
         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)
         application.state.agent_service = AgentService(
             build_graph(persistence.checkpointer), persistence.store
         )
@@ -38,19 +49,21 @@ 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 persistence.close()
+            await stop_material_server(material_server)
         finally:
             try:
-                await close_decision_engine()
+                await persistence.close()
             finally:
                 try:
-                    await close_user_center()
+                    await close_decision_engine()
                 finally:
                     try:
-                        await asyncio.to_thread(flush_tracing)
+                        await close_user_center()
                     finally:
-                        await logger.complete()
-
+                        try:
+                            await asyncio.to_thread(flush_tracing)
+                        finally:
+                            await logger.complete()
 
 def create_app() -> FastAPI:
     application = FastAPI(title="Screen Agent API", lifespan=lifespan)