修复重构后的导入错误和缺失模块

backend/app/main_graph/nodes/router.py

@@ -7,9 +7,9 @@ from typing import Literal
 from langchain_core.messages import AIMessage
 
 # 本地模块
-from ..config import ENABLE_GRAPH_TRACE, MEMORY_SUMMARIZE_INTERVAL
+from app.config import ENABLE_GRAPH_TRACE, MEMORY_SUMMARIZE_INTERVAL
 from app.main_graph.state import MessagesState
-from ..logger import info
+from app.logger import info
 
 
 def should_continue(state: MessagesState) -> Literal['tool_node', 'summarize', 'finalize']: