feat: 完善联网搜索功能集成到React模式

backend/app/main_graph/utils/subgraph_builder.py

@@ -10,6 +10,7 @@ from app.main_graph.state import MainGraphState, CurrentAction
 from .react_nodes import (
     init_state_node,
     react_reason_node,
+    web_search_node,  # ⭐ 新增
     error_handling_node,
     final_response_node,
     route_by_reasoning
@@ -109,10 +110,13 @@ def build_react_main_graph() -> StateGraph:
     # 3. RAG 检索节点
     graph.add_node("rag_retrieve", rag_retrieve_node)
     
-    # 4. 错误处理节点
+    # 4. 联网搜索节点 ⭐ 新增
+    graph.add_node("web_search", web_search_node)
+    
+    # 5. 错误处理节点
     graph.add_node("handle_error", error_handling_node)
     
-    # 5. 最终回答节点
+    # 6. 最终回答节点
     graph.add_node("final_response", final_response_node)
     
     # ========== 添加子图节点 ==========
@@ -151,6 +155,9 @@ def build_react_main_graph() -> StateGraph:
             # 检索分支 → 检索后回到推理
             "rag_retrieve": "rag_retrieve",
             
+            # 联网搜索分支 ⭐ 新增
+            "web_search": "web_search",
+            
             # 子图分支 → 子图后回到推理
             "contact_subgraph": "contact_subgraph",
             "dictionary_subgraph": "dictionary_subgraph",
@@ -164,8 +171,9 @@ def build_react_main_graph() -> StateGraph:
         }
     )
     
-    # 4. 循环边：检索/子图/错误处理 后 → 回到推理
+    # 4. 循环边：检索/搜索/子图/错误处理 后 → 回到推理
     graph.add_edge("rag_retrieve", "react_reason")
+    graph.add_edge("web_search", "react_reason")  # ⭐ 新增
     graph.add_edge("contact_subgraph", "react_reason")
     graph.add_edge("dictionary_subgraph", "react_reason")
     graph.add_edge("news_analysis_subgraph", "react_reason")