导入方式修改

backend/app/subgraphs/news_analysis/api_client.py

@@ -23,20 +23,19 @@ class NewsAPIClient:
     news_repository: Optional[Any] = None
     
     def __post_init__(self):
-        """初始化后设置MCP"""
-        import asyncio
-        try:
-            asyncio.create_task(self._init_mcp())
-        except RuntimeError:
-            pass
-    
+        """初始化后设置（延迟初始化标志）"""
+        self._mcp_initialized = False  # 延迟初始化标志
+
     async def _init_mcp(self):
-        """初始化MCP系统"""
+        """初始化MCP系统（延迟初始化）"""
+        if self._mcp_initialized:
+            return  # 已初始化，跳过
         if not mcp_manager.get_adapter("news"):
             mcp_manager.register_adapter(
                 NewsAdapter(news_repo=self.news_repository)
             )
             await mcp_manager.initialize()
+        self._mcp_initialized = True
     
     async def query_news(
         self, 

backend/app/subgraphs/news_analysis/nodes.py

@@ -7,7 +7,7 @@ from typing import Dict, Any
 from datetime import datetime
 
 # 公共工具
-from app.core import MarkdownFormatter
+from ...core import MarkdownFormatter
 
 from .state import (
     NewsAnalysisState,