重构：移除对 debug_info 的依赖，只使用新的结构化状态字段

backend/app/main_graph/nodes/hybrid_router.py

@@ -187,17 +187,7 @@ async def hybrid_router_node(state: MainGraphState, config: Optional[RunnableCon
         info("[Hybrid Router] 规则未命中，使用 LLM 分类")
         decision = await _classify_with_llm(query)
 
-    # 3. 更新状态（同时更新旧的 debug_info 和新的结构化字段）
-    state.debug_info["hybrid_decision"] = {
-        "intent": decision.intent,
-        "confidence": decision.confidence,
-        "path": decision.path,
-        "reasoning": decision.reasoning,
-        "suggested_tools": decision.suggested_tools
-    }
-    state.debug_info["hybrid_start_time"] = datetime.now().isoformat()
-    
-    # 更新新的结构化字段
+    # 步骤3: 更新状态 - 只使用新的结构化字段
     state.hybrid_router.decision = decision
     state.hybrid_router.start_time = datetime.now().isoformat()
 
@@ -221,9 +211,11 @@ async def hybrid_router_node(state: MainGraphState, config: Optional[RunnableCon
 
 # ========== 条件路由函数 ==========
 def route_from_hybrid_decision(state: MainGraphState) -> str:
-    """从混合路由决策获取下一步节点"""
-    decision = state.debug_info.get("hybrid_decision", {})
-    return decision.get("path", "react_loop")
+    """从混合路由决策获取下一步节点 - 使用新的结构化字段"""
+    decision = state.hybrid_router.decision
+    if decision and hasattr(decision, 'path'):
+        return decision.path
+    return "react_loop"
 
 
 def check_fast_path_success(state: MainGraphState) -> str: