优化：统一意图分类逻辑，复用 intent.py，删除冗余的 intent_classifier.py

backend/app/main_graph/nodes/hybrid_router.py

@@ -1,10 +1,10 @@
 """
 混合路由节点模块 - 前置路由决策
 负责决定走快速路径还是 React 循环
+
+复用 intent.py 的推理逻辑，保证判断一致！
 """
 
-import re
-import json
 from typing import Optional
 from dataclasses import dataclass, field
 from datetime import datetime
@@ -12,9 +12,13 @@ from langchain_core.runnables.config import RunnableConfig
 
 from ..state import MainGraphState
 from backend.app.logger import info, debug
-from ...model_services.chat_services import get_small_llm_service
+# 直接复用 intent.py 的推理逻辑！
+from backend.app.core.intent import (
+    react_reason_async,
+    ReasoningResult,
+    ReasoningAction,
+)
 from ._utils import dispatch_custom_event
-from backend.app.core.json_parser import extract_and_parse_json, safe_get, safe_get_float, safe_get_str
 
 
 # ========== 核心数据类型 ==========
@@ -29,6 +33,7 @@ class HybridRouterResult:
 
 
 # ========== 规则配置 ==========
+# 保留规则分流，保持快速响应
 CHITCHAT_KEYWORDS = {
     "你好", "您好", "hi", "hello", "hey", "早上好", "晚上好", "下午好",
     "谢谢", "感谢", "多谢", "thanks", "thank you",
@@ -42,37 +47,48 @@ SUBGRAPH_KEYWORDS = {
 }
 
 
-# ========== 意图分类 Prompt 模板 ==========
-INTENT_CLASSIFICATION_PROMPT = """你是一个专业的意图分类助手。请分析用户的查询，并输出 JSON 格式的结果。
+# ========== 从 ReasoningResult 映射到 HybridRouterResult ==========
+def _map_reasoning_to_router(reasoning_result: ReasoningResult) -> HybridRouterResult:
+    """将 intent.py 的推理结果映射为 hybrid_router 的结果"""
 
-【格式要求】
-你必须严格输出 JSON 格式，不要加任何 Markdown 代码块标记（如 ```json）。
-仅输出纯 JSON 字符串，不要有其他解释文字。
+    # ReasoningAction -> intent 映射
+    intent_map = {
+        ReasoningAction.DIRECT_RESPONSE: "chitchat",
+        ReasoningAction.RETRIEVE_RAG: "knowledge",
+        ReasoningAction.RE_RETRIEVE_RAG: "knowledge",
+        ReasoningAction.WEB_SEARCH: "complex",  # WEB_SEARCH 走 React循环
+        ReasoningAction.ROUTE_SUBGRAPH: "tool",
+        ReasoningAction.CLARIFY: "chitchat",
+        ReasoningAction.UNKNOWN: "complex",
+    }
 
-【意图类型（4选一）：
-- chitchat: 闲聊、问候、感谢、道别（不需要工具）
-- knowledge: 知识查询（需要查询知识库）
-- tool: 工具操作（需要调用通讯录/词典/新闻等子图）
-- complex: 复杂任务（多步骤、不确定、或需要推理）
+    # ReasoningAction -> path 映射
+    path_map = {
+        ReasoningAction.DIRECT_RESPONSE: "fast_chitchat",
+        ReasoningAction.RETRIEVE_RAG: "fast_rag",
+        ReasoningAction.RE_RETRIEVE_RAG: "fast_rag",
+        ReasoningAction.WEB_SEARCH: "react_loop",  # WEB_SEARCH 走 React循环
+        ReasoningAction.ROUTE_SUBGRAPH: "fast_tool",
+        ReasoningAction.CLARIFY: "fast_chitchat",
+        ReasoningAction.UNKNOWN: "react_loop",
+    }
 
-【输出格式】
-{{
-    "intent": "chitchat|knowledge|tool|complex",
-    "confidence": 0.85,
-    "reasoning": "简要说明理由",
-    "suggested_tools": ["contact|dictionary|news_analysis", "other"]
-}}
+    intent = intent_map.get(reasoning_result.action, "complex")
+    path = path_map.get(reasoning_result.action, "react_loop")
 
-【重要提示】
-- 如果不能100%确定意图，请选择 "complex"，置信度设低一些。
-- confidence 是你对当前分类的信心（0.0-1.0）。
-- suggested_tools 仅在 intent=tool 时提供，否则设为空数组。
+    suggested_tools = []
+    if reasoning_result.action == ReasoningAction.ROUTE_SUBGRAPH:
+        target_subgraph = reasoning_result.metadata.get("target_subgraph")
+        if target_subgraph:
+            suggested_tools = [target_subgraph]
 
-【用户查询】
-{query}
-
-【现在开始】
-请根据以上信息，输出你的分类 JSON："""
+    return HybridRouterResult(
+        intent=intent,
+        confidence=reasoning_result.confidence,
+        suggested_tools=suggested_tools,
+        path=path,
+        reasoning=reasoning_result.reasoning
+    )
 
 
 # ========== 规则分流（<5ms） ==========
@@ -112,66 +128,20 @@ def _rule_based_redirect(query: str) -> Optional[HybridRouterResult]:
     return None
 
 
-# ========== LLM 分类 ==========
-async def _classify_with_llm(query: str) -> HybridRouterResult:
-    """使用轻量级 LLM 进行意图分类"""
-    try:
-        llm = get_small_llm_service()
-        prompt = INTENT_CLASSIFICATION_PROMPT.format(query=query)
-        response = await llm.ainvoke(prompt)
-
-        # 使用新的 JSON 解析器
-        parse_result = extract_and_parse_json(response.content)
-        if not parse_result.success or not parse_result.data:
-            return _default_result()
-
-        return _parse_classification_result(parse_result.data)
-
-    except Exception as e:
-        debug(f"LLM 分类失败: {e}")
-        return _default_result()
-
-
-def _parse_classification_result(data: dict) -> HybridRouterResult:
-    """解析分类结果"""
-    intent = safe_get_str(data, "intent", "complex")
-    confidence = safe_get_float(data, "confidence", 0.3)
-    suggested_tools = safe_get(data, "suggested_tools", [])
-    reasoning = safe_get_str(data, "reasoning", "")
-
-    # 置信度低于阈值，走 complex
-    if confidence < 0.5:
-        intent = "complex"
-
-    # intent -> path 映射
-    path_map = {
-        "chitchat": "fast_chitchat",
-        "knowledge": "fast_rag",
-        "tool": "fast_tool",
-    }
-
-    return HybridRouterResult(
-        intent=intent,
-        confidence=confidence,
-        suggested_tools=suggested_tools,
-        path=path_map.get(intent, "react_loop"),
-        reasoning=reasoning
-    )
-
-
+# ========== 默认结果 ==========
 def _default_result() -> HybridRouterResult:
-    """默认结果（LLM 失败时）"""
+    """默认结果"""
     return HybridRouterResult(
         intent="complex",
         confidence=0.3,
         path="react_loop",
-        reasoning="LLM 调用失败，降级到 React 循环"
+        reasoning="降级到默认值，走 React 循环"
     )
 
 
 # ========== 主路由节点 ==========
 async def hybrid_router_node(state: MainGraphState, config: Optional[RunnableConfig] = None) -> MainGraphState:
-    """混合路由节点：前置路由，决定走快速路径还是 React 循环"""
+    """混合路由节点：前置路由，决定走快速路径还是 React循环"""
     state.current_phase = "hybrid_router"
     query = state.user_query or ""
 
@@ -183,11 +153,17 @@ async def hybrid_router_node(state: MainGraphState, config: Optional[RunnableCon
         decision = rule_result
         info(f"[Hybrid Router] 规则命中: {decision.path}")
     else:
-        # 2. LLM 分类
-        info("[Hybrid Router] 规则未命中，使用 LLM 分类")
-        decision = await _classify_with_llm(query)
+        # 2. 复用 intent.py 的推理逻辑！保证判断一致！
+        info("[Hybrid Router] 规则未命中，使用 intent.py 推理")
+        try:
+            reasoning_result = await react_reason_async(query, {})
+            decision = _map_reasoning_to_router(reasoning_result)
+            info(f"[Hybrid Router] 推理结果: action={reasoning_result.action.name}, path={decision.path}")
+        except Exception as e:
+            debug(f"[Hybrid Router] intent.py 推理失败: {e}")
+            decision = _default_result()
 
-    # 步骤3: 更新状态 - 只使用新的结构化字段
+    # 3. 更新状态
     state.hybrid_router.decision = decision
     state.hybrid_router.start_time = datetime.now().isoformat()
 
@@ -211,7 +187,7 @@ 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 - 使用新的结构化字段"""
+    """从混合路由决策获取下一步节点"""
     decision = state.hybrid_router.decision
     if decision and hasattr(decision, 'path'):
         return decision.path
@@ -219,11 +195,11 @@ def route_from_hybrid_decision(state: MainGraphState) -> str:
 
 
 def check_fast_path_success(state: MainGraphState) -> str:
-    """检查快速路径是否成功 - 使用新的结构化字段"""
+    """检查快速路径是否成功"""
     if state.fast_path.failed:
         info("[Fast Path Check] 快速路径失败，升级到 React 循环")
         return "escalate"
-    
+
     info("[Fast Path Check] 快速路径成功，进入 llm_call")
     return "llm_call"