导入方式修改

backend/app/utils/logging.py

@@ -3,9 +3,9 @@ LangGraph 节点日志工具模块
 提供状态流转追踪和 LLM 输入输出打印功能
 """
 
-from app.config import ENABLE_GRAPH_TRACE
-from app.logger import debug, info
-from app.main_graph.state import MainGraphState
+from ..config import ENABLE_GRAPH_TRACE
+from ..logger import debug, info
+from ..main_graph.state import MainGraphState
 
 
 def log_state_change(node_name: str, state: MainGraphState, prefix: str = "进入"):
@@ -17,7 +17,7 @@ def log_state_change(node_name: str, state: MainGraphState, prefix: str = "进
         state: 当前状态
         prefix: 日志前缀（"进入" 或 "离开"）
     """
-    from app.logger import info
+    from backend.app.logger import info
 
     messages = state.messages
     msg_count = len(messages)