修复重构后的导入错误和缺失模块

backend/app/main_graph/nodes/summarize.py

@@ -7,9 +7,9 @@ from typing import Any, Dict
 
 # 本地模块
 from app.main_graph.state import MessagesState
-from ..memory.mem0_client import Mem0Client
-from ..utils.logging import log_state_change
-from ..logger import debug, info, error, warning
+from app.memory.mem0_client import Mem0Client
+from app.utils.logging import log_state_change
+from app.logger import debug, info, error, warning
 
 def create_summarize_node(mem0_client: Mem0Client):
     """