修复导入错误：更新 router.py 到 MainGraphState

backend/app/main_graph/nodes/__init__.py

@@ -2,18 +2,42 @@
 主图节点模块导出
 """
 
-from .router import should_continue
+# 新的 React 模式节点
+from .react_nodes import (
+    init_state_node,
+    react_reason_node,
+    web_search_node,
+    error_handling_node,
+    route_by_reasoning
+)
 from .llm_call import create_llm_call_node
-from .tool_call import create_tool_call_node
+from .rag_nodes import rag_retrieve_node
+
+# 记忆节点（已更新到 MainGraphState）
 from .retrieve_memory import create_retrieve_memory_node
+from .memory_trigger import memory_trigger_node, set_mem0_client
 from .summarize import create_summarize_node
 from .finalize import finalize_node
 
+# 路由（已更新到 MainGraphState）
+from .router import should_continue
+
 __all__ = [
-    "should_continue",
+    # React 模式节点
+    "init_state_node",
+    "react_reason_node",
+    "web_search_node",
+    "error_handling_node",
+    "route_by_reasoning",
+    # 通用节点
     "create_llm_call_node",
-    "create_tool_call_node",
+    "rag_retrieve_node",
+    # 记忆节点
     "create_retrieve_memory_node",
+    "memory_trigger_node",
+    "set_mem0_client",
     "create_summarize_node",
     "finalize_node",
+    # 路由
+    "should_continue",
 ]