refactor: 重写 intent.py，使用真实 LLM 服务进行 React 模式推理

- 重写 intent.py，整合 chat_services.py
- 支持 LLM 推理 + 规则降级策略
- 支持子图路由（contact/dictionary/news_analysis）
- 保持与现有 react_nodes.py 兼容
- 更新 react_nodes.py 以更好地处理新的接口

backend/app/agent_subgraphs/common/intent.py

@@ -6,64 +6,89 @@ Intent Understanding & Reasoning Module (React Pattern)
 1. 理解用户的查询意图
 2. 判断是否需要调用 RAG 检索
 3. 判断是否需要重新检索
-4. 决定下一步的行动
-5. 支持条件路由扩展
+4. 决定下一步的动作（路由到子图、直接回答等）
 
-核心组件：
-- ReasoningAction: 推理动作枚举
-- ReasoningResult: 推理结果数据类
-- ReactIntentReasoner: React 模式意图推理器
+核心设计：
+- 使用项目已有的 chat_services.py 进行 LLM 调用
+- 保持与现有架构一致（服务层模式）
+- 支持降级策略（LLM 失败时回退到规则）
+- 与 react_nodes.py 无缝集成
 """
 
 import re
-from typing import Dict, Any, Optional, List, Set, Tuple
+import json
+from typing import Dict, Any, Optional, List
 from dataclasses import dataclass, field
 from enum import Enum, auto
-from abc import ABC, abstractmethod
 
 
+# ========== 1. 核心数据类型 ==========
+
 class ReasoningAction(Enum):
     """推理动作枚举 - 决定下一步做什么"""
     DIRECT_RESPONSE = auto()  # 直接回答，不需要额外信息
     RETRIEVE_RAG = auto()     # 需要调用 RAG 检索
-    RERIEVE_RAG = auto()      # 需要重新检索 (优化前版本，兼容保留)
-    RE_RETRIEVE_RAG = auto()  # 需要重新检索 (修正拼写)
-    CALL_TOOL = auto()        # 需要调用其他工具
+    RE_RETRIEVE_RAG = auto()  # 需要重新检索（更多/更好结果）
+    ROUTE_SUBGRAPH = auto()   # 需要路由到子图（contact/dictionary/news_analysis）
     CLARIFY = auto()          # 需要澄清用户的问题
-    ROUTE_SUBGRAPH = auto()   # 需要路由到子图
     UNKNOWN = auto()          # 未知动作
 
 
 @dataclass
 class RetrievalConfig:
     """检索配置"""
-    need_retrieval: bool = False  # 是否需要检索
-    need_re_retrieval: bool = False  # 是否需要重新检索
-    retrieval_query: Optional[str] = None  # 优化后的检索查询
-    collection_name: Optional[str] = None  # 检索的集合名称
-    k: int = 5  # 返回数量
-    score_threshold: float = 0.3  # 相似度阈值
+    need_retrieval: bool = False
+    need_re_retrieval: bool = False
+    retrieval_query: Optional[str] = None
+    target_subgraph: Optional[str] = None
+    collection_name: Optional[str] = None
+    k: int = 5
     metadata: Dict[str, Any] = field(default_factory=dict)
 
 
 @dataclass
 class ReasoningResult:
     """推理结果数据类"""
-    action: ReasoningAction = ReasoningAction.UNKNOWN  # 决定的动作
-    confidence: float = 0.0  # 置信度
-    reasoning: str = ""  # 推理过程说明
+    action: ReasoningAction = ReasoningAction.UNKNOWN
+    confidence: float = 0.0
+    reasoning: str = ""
     retrieval_config: RetrievalConfig = field(default_factory=RetrievalConfig)
-    extracted_entities: Dict[str, Any] = field(default_factory=dict)  # 提取的实体
-    next_hints: List[str] = field(default_factory=list)  # 下一步提示
-    original_query: str = ""  # 原始查询
+    extracted_entities: Dict[str, Any] = field(default_factory=dict)
+    next_hints: List[str] = field(default_factory=list)
+    original_query: str = ""
     metadata: Dict[str, Any] = field(default_factory=dict)
 
 
-class BaseIntentReasoner(ABC):
-    """意图推理器基类"""
+# ========== 2. React 推理器 ==========
 
-    @abstractmethod
-    def reason(
+class ReactIntentReasoner:
+    """
+    React 模式意图推理器
+    
+    核心功能：
+    1. 使用 LLM 分析用户意图
+    2. 决定是否需要 RAG 检索/重新检索
+    3. 决定是否需要路由到子图
+    4. 提供降级策略（规则匹配）
+    """
+
+    def __init__(self):
+        """初始化推理器 - 懒加载 LLM 服务"""
+        self._llm_service = None
+        self._subgraph_keywords = {
+            "contact": ["通讯录", "联系人", "contact", "email", "邮件", "邮箱"],
+            "dictionary": ["词典", "单词", "翻译", "dictionary", "translate", "生词"],
+            "news_analysis": ["资讯", "新闻", "分析", "news", "report", "热点"]
+        }
+
+    def _get_llm_service(self):
+        """懒加载 LLM 服务（避免循环导入）"""
+        if self._llm_service is None:
+            from app.model_services.chat_services import get_chat_service
+            self._llm_service = get_chat_service()
+        return self._llm_service
+
+    async def reason(
         self,
         query: str,
         context: Optional[Dict[str, Any]] = None
@@ -73,297 +98,262 @@ class BaseIntentReasoner(ABC):
         
         Args:
             query: 用户查询
-            context: 上下文信息，可能包括：
-                - messages: 对话历史
-                - retrieved_docs: 已检索的文档
-                - previous_actions: 之前的动作
-                - user_id: 用户ID
-                - etc.
+            context: 上下文信息（可能包含已检索文档、对话历史等）
         
         Returns:
-            ReasoningResult: 推理结果
-        """
-        pass
-
-
-class RuleBasedReactReasoner(BaseIntentReasoner):
-    """基于规则的 React 推理器"""
-    
-    def __init__(self):
-        # 检索触发关键词
-        self._retrieval_keywords = {
-            "什么", "怎么", "如何", "为什么", "哪", "谁", "多少",
-            "介绍", "解释", "说明", "资料", "文档", "查询", "搜索",
-            "find", "search", "what", "how", "why", "where", "who",
-            "tell me", "explain", "about", "information"
-        }
-        
-        # 重新检索触发关键词
-        self._re_retrieval_keywords = {
-            "再", "重新", "更多", "不够", "不足", "其他", "另外",
-            "没找到", "找不到", "没有", "不对", "不是",
-            "again", "more", "another", "other", "didn't find", "not enough"
-        }
-        
-        # 澄清触发关键词
-        self._clarify_keywords = {
-            "?", "？", "哪个", "哪些", "哪位", "什么意思",
-            "请问", "能详细", "具体点", "举个例子"
-        }
-        
-        # 工具调用关键词
-        self._tool_keywords = {
-            "天气", "weather", "邮件", "email", "联系人", "contact",
-            "翻译", "translate", "词典", "dictionary"
-        }
-        
-        # 子图路由关键词映射
-        self._subgraph_keywords = {
-            "contact": {"通讯录", "联系人", "contact", "email", "邮件"},
-            "dictionary": {"词典", "单词", "翻译", "dictionary", "translate"},
-            "news_analysis": {"资讯", "新闻", "分析", "news", "report"},
-        }
-        
-        # 直接回答模式（问候、感谢等）
-        self._direct_response_patterns = [
-            (r'^(你好|您好|hi|hello|hey|早上好|下午好|晚上好|哈喽)', ReasoningAction.DIRECT_RESPONSE),
-            (r'^(谢谢|感谢|多谢|thanks|thank you)', ReasoningAction.DIRECT_RESPONSE),
-            (r'^(再见|拜拜|bye|goodbye|回见)', ReasoningAction.DIRECT_RESPONSE),
-        ]
-    
-    def reason(
-        self, 
-        query: str, 
-        context: Optional[Dict[str, Any]] = None
-    ) -> ReasoningResult:
-        """
-        基于规则的推理
+            ReasoningResult
         """
         context = context or {}
-        query_lower = query.lower()
         result = ReasoningResult(original_query=query)
 
-        # 1. 先检查是否是直接回答模式
-        for pattern, action in self._direct_response_patterns:
-            if re.match(pattern, query, re.IGNORECASE):
-                result.action = action
-                result.confidence = 0.95
-                result.reasoning = "检测到问候、感谢或告别语，直接回答"
+        # 策略1: 尝试使用 LLM 推理
+        try:
+            llm_result = await self._reason_with_llm(query, context)
+            if llm_result.confidence >= 0.6:  # 置信度足够高，直接返回
+                return llm_result
+        except Exception as e:
+            print(f"[ReactReasoner] LLM 推理失败: {e}, 回退到规则")
+
+        # 策略2: LLM 失败或置信度低，使用规则匹配
+        return self._reason_with_rules(query, context)
+
+    async def _reason_with_llm(
+        self,
+        query: str,
+        context: Dict[str, Any]
+    ) -> ReasoningResult:
+        """使用 LLM 进行推理"""
+        prompt = self._build_reasoning_prompt(query, context)
+        llm = self._get_llm_service()
+
+        response = await llm.ainvoke(prompt)
+        return self._parse_llm_response(response.content, query)
+
+    def _build_reasoning_prompt(self, query: str, context: Dict[str, Any]) -> str:
+        """构建推理提示词"""
+        # 构建上下文描述
+        context_parts = []
+        if context.get("retrieved_docs"):
+            context_parts.append(f"- 已检索文档: {len(context['retrieved_docs'])} 条")
+        if context.get("previous_actions"):
+            context_parts.append(f"- 历史动作: {context['previous_actions']}")
+
+        context_str = "\n".join(context_parts) if context_parts else "无"
+
+        return f"""你是一个专业的意图推理助手。请分析用户的查询，决定下一步应该做什么。
+
+可选动作：
+1. DIRECT_RESPONSE - 直接回答（闲聊、打招呼、不需要额外信息）
+2. RETRIEVE_RAG - 需要查询知识库（询问知识、政策、文档等）
+3. RE_RETRIEVE_RAG - 需要重新检索（之前的结果不够，或者用户明确说"再查查"、"更多"）
+4. ROUTE_SUBGRAPH - 需要路由到专门的子图：
+   - contact: 通讯录、联系人、邮件相关
+   - dictionary: 词典、翻译、单词相关
+   - news_analysis: 资讯、新闻、热点分析相关
+5. CLARIFY - 需要澄清用户的问题（问题不明确）
+
+用户查询: {query}
+当前上下文:
+{context_str}
+
+请按以下 JSON 格式输出（仅输出 JSON，不要其他内容）:
+{{
+    "action": "DIRECT_RESPONSE|RETRIEVE_RAG|RE_RETRIEVE_RAG|ROUTE_SUBGRAPH|CLARIFY",
+    "confidence": 0.85,
+    "reasoning": "简要说明理由",
+    "target_subgraph": "contact|dictionary|news_analysis|null (仅当 action=ROUTE_SUBGRAPH 时)",
+    "retrieval_query": "优化后的检索查询 (可选)"
+}}
+"""
+
+    def _parse_llm_response(self, response: str, original_query: str) -> ReasoningResult:
+        """解析 LLM 响应"""
+        result = ReasoningResult(original_query=original_query)
+
+        # 提取 JSON
+        json_match = re.search(r'\{[\s\S]*\}', response)
+        if not json_match:
+            # 没有 JSON，回退到规则
+            result.confidence = 0.0
             return result
 
-        # 2. 检查是否需要路由到子图（优先级高于重新检索，避免"有没有"误触发）
-        for subgraph, keywords in self._subgraph_keywords.items():
+        try:
+            data = json.loads(json_match.group())
+            action_str = data.get("action", "UNKNOWN")
+
+            # 转换为枚举
+            try:
+                result.action = ReasoningAction[action_str]
+            except KeyError:
+                result.action = ReasoningAction.UNKNOWN
+
+            result.confidence = float(data.get("confidence", 0.5))
+            result.reasoning = data.get("reasoning", "")
+
+            # 处理子图路由
+            if result.action == ReasoningAction.ROUTE_SUBGRAPH:
+                result.retrieval_config.target_subgraph = data.get("target_subgraph")
+                result.metadata["target_subgraph"] = data.get("target_subgraph")
+
+            # 处理检索查询
+            if result.action in [ReasoningAction.RETRIEVE_RAG, ReasoningAction.RE_RETRIEVE_RAG]:
+                result.retrieval_config.need_retrieval = True
+                result.retrieval_config.need_re_retrieval = (result.action == ReasoningAction.RE_RETRIEVE_RAG)
+                result.retrieval_config.retrieval_query = data.get("retrieval_query", original_query)
+
+            return result
+        except Exception as e:
+            print(f"[ReactReasoner] 解析 LLM 响应失败: {e}")
+            result.confidence = 0.0
+            return result
+
+    def _reason_with_rules(
+        self,
+        query: str,
+        context: Dict[str, Any]
+    ) -> ReasoningResult:
+        """基于规则的降级推理"""
+        result = ReasoningResult(original_query=query)
+        query_lower = query.lower()
+
+        # 1. 检查子图路由（最高优先级）
+        for subgraph_name, keywords in self._subgraph_keywords.items():
             if any(kw in query_lower for kw in keywords):
                 result.action = ReasoningAction.ROUTE_SUBGRAPH
-                result.confidence = 0.9
-                result.reasoning = f"检测到 {subgraph} 子图意图"
-                result.metadata["target_subgraph"] = subgraph
+                result.confidence = 0.85
+                result.reasoning = f"关键词匹配: {subgraph_name} 子图"
+                result.retrieval_config.target_subgraph = subgraph_name
+                result.metadata["target_subgraph"] = subgraph_name
                 return result
 
-        # 3. 检查是否需要重新检索
-        has_re_retrieval = any(kw in query_lower for kw in self._re_retrieval_keywords)
-        # 同时检查上下文中是否有之前的检索结果但不够好
-        previous_retrieval = context.get("retrieved_docs")
-        if has_re_retrieval or (previous_retrieval and len(previous_retrieval) < 2):
+        # 2. 检查是否需要重新检索
+        re_retrieve_keywords = ["再", "重新", "更多", "不够", "其他", "没找到", "找不到", "不对", "another", "again", "more"]
+        has_re_retrieve = any(kw in query_lower for kw in re_retrieve_keywords)
+        has_docs = context.get("retrieved_docs") and len(context["retrieved_docs"]) > 0
+
+        if has_re_retrieve or (has_docs and len(context["retrieved_docs"]) < 2):
             result.action = ReasoningAction.RE_RETRIEVE_RAG
-            result.confidence = 0.85 if has_re_retrieval else 0.7
-            result.reasoning = "检测到需要重新检索的意图"
-            result.retrieval_config = RetrievalConfig(
-                need_retrieval=True,
-                need_re_retrieval=True,
-                retrieval_query=self._optimize_retrieval_query(query),
-                k=10  # 重新检索时返回更多结果
-            )
+            result.confidence = 0.8 if has_re_retrieve else 0.65
+            result.reasoning = "需要重新检索更多/更好结果"
+            result.retrieval_config.need_retrieval = True
+            result.retrieval_config.need_re_retrieval = True
+            result.retrieval_config.retrieval_query = query
             return result
 
-        # 4. 检查是否需要调用工具
-        has_tool = any(kw in query_lower for kw in self._tool_keywords)
-        if has_tool:
-            result.action = ReasoningAction.CALL_TOOL
-            result.confidence = 0.8
-            result.reasoning = "检测到工具调用意图"
+        # 3. 检查是否需要 RAG 检索
+        retrieve_keywords = ["什么", "怎么", "如何", "为什么", "哪", "谁", "介绍", "解释", "说明", "资料", "文档", "查询", "搜索", "what", "how", "why", "where", "who", "tell me", "explain", "about", "information"]
+        has_retrieve = any(kw in query_lower for kw in retrieve_keywords)
+
+        if has_retrieve or len(query.strip()) > 5:
+            result.action = ReasoningAction.RETRIEVE_RAG
+            result.confidence = 0.8 if has_retrieve else 0.6
+            result.reasoning = "需要查询知识库"
+            result.retrieval_config.need_retrieval = True
+            result.retrieval_config.retrieval_query = query
+            return result
+
+        # 4. 检查直接回答
+        direct_keywords = ["你好", "您好", "hi", "hello", "hey", "早上好", "晚上好", "下午好", "嗨", "谢谢", "感谢", "多谢", "thanks", "thank you", "再见", "拜拜", "goodbye", "回见"]
+        if any(kw in query_lower for kw in direct_keywords):
+            result.action = ReasoningAction.DIRECT_RESPONSE
+            result.confidence = 0.9
+            result.reasoning = "直接回答（问候/感谢/道别）"
             return result
 
         # 5. 检查是否需要澄清
-        has_clarify = any(kw in query_lower for kw in self._clarify_keywords)
-        # 或者查询太短、太模糊
-        if has_clarify or len(query.strip()) < 3:
+        if len(query.strip()) < 3 or any(q in query for q in ["?", "？", "哪个", "哪些", "什么意思", "请", "能详细"]):
             result.action = ReasoningAction.CLARIFY
-            result.confidence = 0.75
-            result.reasoning = "检测到需要澄清的意图"
-            result.next_hints = [
-                "请提供更多细节",
-                "您想了解什么方面的内容？",
-                "能否具体说明一下？"
-            ]
+            result.confidence = 0.7
+            result.reasoning = "需要澄清问题"
+            result.next_hints = ["请提供更多细节", "您想了解什么方面的内容？", "能否具体说明一下？"]
             return result
 
-        # 6. 检查是否需要 RAG 检索
-        has_retrieval = any(kw in query_lower for kw in self._retrieval_keywords)
-        if has_retrieval or len(query.strip()) > 5:
-            result.action = ReasoningAction.RETRIEVE_RAG
-            result.confidence = 0.85 if has_retrieval else 0.6
-            result.reasoning = "检测到需要检索知识库的意图"
-            result.retrieval_config = RetrievalConfig(
-                need_retrieval=True,
-                retrieval_query=self._optimize_retrieval_query(query),
-                k=5
-            )
-            return result
-        
-        # 7. 默认直接回答
+        # 6. 默认直接回答
         result.action = ReasoningAction.DIRECT_RESPONSE
-        result.confidence = 0.6
+        result.confidence = 0.5
         result.reasoning = "默认直接回答模式"
         return result
 
-    def _optimize_retrieval_query(self, query: str) -> str:
-        """优化检索查询，去掉不必要的语气词"""
-        # 去掉常见的前缀
-        prefixes_to_remove = [
-            "请告诉我", "帮我查一下", "我想知道", "能不能告诉我",
-            "请问", "你知道", "帮我找", "搜索一下", "查询一下"
-        ]
-        optimized = query
-        for prefix in prefixes_to_remove:
-            if optimized.startswith(prefix):
-                optimized = optimized[len(prefix):]
 
-        # 去掉常见的后缀
-        suffixes_to_remove = ["吗？", "呢？", "吧？", "吗", "呢", "吧", "？", "?"]
-        for suffix in suffixes_to_remove:
-            if optimized.endswith(suffix):
-                optimized = optimized[:-len(suffix)]
+# ========== 3. 便捷函数（保持与旧代码兼容） ==========
 
-        return optimized.strip()
+# 全局推理器实例（懒加载）
+_reasoner: Optional[ReactIntentReasoner] = None
 
 
-class LLMReactReasoner(BaseIntentReasoner):
-    """
-    基于 LLM 的 React 推理器
-    使用大语言模型进行更智能的推理判断
-    """
+def _get_reasoner() -> ReactIntentReasoner:
+    """获取推理器实例"""
+    global _reasoner
+    if _reasoner is None:
+        _reasoner = ReactIntentReasoner()
+    return _reasoner
 
-    def __init__(self, llm_client=None):
-        """
-        初始化 LLM 推理器
 
-        Args:
-            llm_client: LLM 客户端，需要支持调用方法
-        """
-        self.llm_client = llm_client
-        self.rule_based = RuleBasedReactReasoner()
-    
-    def reason(
-        self, 
+async def react_reason_async(
     query: str,
     context: Optional[Dict[str, Any]] = None
 ) -> ReasoningResult:
     """
-        使用 LLM 进行推理，失败时回退到规则推理
-        """
-        try:
-            if self.llm_client:
-                return self._reason_with_llm(query, context)
-        except Exception:
-            pass
-        
-        # LLM 不可用或失败，回退到规则推理
-        return self.rule_based.reason(query, context)
-    
-    def _reason_with_llm(
-        self, 
-        query: str, 
-        context: Optional[Dict[str, Any]] = None
-    ) -> ReasoningResult:
-        """
-        使用 LLM 进行推理（需要实现具体的 LLM 调用逻辑）
-        """
-        # 这里是一个示例实现，实际项目需要连接真实的 LLM
-        prompt = self._build_reasoning_prompt(query, context)
-        
-        # 模拟 LLM 返回（实际项目中替换为真实调用）
-        # 这里我们还是先调用规则推理作为示例
-        return self.rule_based.reason(query, context)
-    
-    def _build_reasoning_prompt(self, query: str, context: Optional[Dict[str, Any]]) -> str:
-        """构建推理提示词"""
-        context_str = ""
-        if context:
-            context_lines = []
-            if "messages" in context:
-                context_lines.append(f"对话历史: {len(context['messages'])} 条")
-            if "retrieved_docs" in context:
-                context_lines.append(f"已检索文档: {len(context['retrieved_docs'])} 条")
-            context_str = "\n".join(context_lines)
-        
-        return f"""你是一个意图推理助手，需要判断用户的查询应该如何处理。
-
-用户查询: {query}
-
-上下文信息:
-{context_str or '无额外上下文'}
-
-请判断下一步应该做什么，可选动作:
-1. DIRECT_RESPONSE - 直接回答，不需要额外信息
-2. RETRIEVE_RAG - 需要调用知识库检索
-3. RE_RETRIEVE_RAG - 需要重新检索更多/更好的结果
-4. CALL_TOOL - 需要调用其他工具
-5. CLARIFY - 需要澄清用户的问题
-6. ROUTE_SUBGRAPH - 需要路由到子图
-
-请以 JSON 格式输出你的判断。
-"""
-
-
-def create_react_reasoner(
-    use_llm: bool = False,
-    llm_client=None
-) -> BaseIntentReasoner:
-    """
-    创建 React 模式意图推理器工厂函数
-    
-    Args:
-        use_llm: 是否使用 LLM 推理
-        llm_client: LLM 客户端实例
-    
-    Returns:
-        BaseIntentReasoner: 推理器实例
-    """
-    if use_llm:
-        return LLMReactReasoner(llm_client)
-    return RuleBasedReactReasoner()
-
-
-# 便捷函数 - 直接推理
-def react_reason(
-    query: str,
-    context: Optional[Dict[str, Any]] = None,
-    reasoner: Optional[BaseIntentReasoner] = None
-) -> ReasoningResult:
-    """
-    便捷函数：直接进行 React 推理
+    便捷函数：异步 React 推理（推荐使用）
     
     Args:
         query: 用户查询
-        context: 上下文信息
-        reasoner: 可选的推理器实例
+        context: 上下文
     
     Returns:
-        ReasoningResult: 推理结果
+        ReasoningResult
     """
-    if reasoner is None:
-        reasoner = create_react_reasoner()
-    return reasoner.reason(query, context)
+    reasoner = _get_reasoner()
+    return await reasoner.reason(query, context)
 
 
-# 条件路由辅助函数
-def get_route_by_reasoning(result: ReasoningResult) -> str:
+def react_reason(
+    query: str,
+    context: Optional[Dict[str, Any]] = None
+) -> ReasoningResult:
     """
-    根据推理结果获取路由字符串
+    便捷函数：同步 React 推理（保持向后兼容）
+    
+    注意：内部会运行事件循环，建议在异步环境中使用 react_reason_async
     
     Args:
-        result: 推理结果
+        query: 用户查询
+        context: 上下文
+    
+    Returns:
+        ReasoningResult
+    """
+    import asyncio
+
+    try:
+        # 尝试获取现有事件循环
+        loop = asyncio.get_event_loop()
+        if loop.is_running():
+            # 已经在运行的循环中，创建任务
+            task = loop.create_task(react_reason_async(query, context))
+            # 注意：这里不能真正等待，会导致死锁
+            # 降级到规则推理
+            print("[ReactReasoner] 检测到运行中的事件循环，使用规则推理")
+            reasoner = _get_reasoner()
+            return reasoner._reason_with_rules(query, context or {})
+    except RuntimeError:
+        pass
+
+    # 创建新的事件循环
+    loop = asyncio.new_event_loop()
+    try:
+        asyncio.set_event_loop(loop)
+        return loop.run_until_complete(react_reason_async(query, context))
+    finally:
+        loop.close()
+
+
+def get_route_by_reasoning(result: ReasoningResult) -> str:
+    """
+    根据推理结果获取路由字符串（与旧代码兼容）
+    
+    Args:
+        result: ReasoningResult
     
     Returns:
         str: 路由标识
@@ -372,10 +362,21 @@ def get_route_by_reasoning(result: ReasoningResult) -> str:
         ReasoningAction.DIRECT_RESPONSE: "direct_response",
         ReasoningAction.RETRIEVE_RAG: "retrieve_rag",
         ReasoningAction.RE_RETRIEVE_RAG: "re_retrieve_rag",
-        ReasoningAction.RERIEVE_RAG: "re_retrieve_rag",  # 兼容旧拼写
-        ReasoningAction.CALL_TOOL: "call_tool",
         ReasoningAction.CLARIFY: "clarify",
         ReasoningAction.ROUTE_SUBGRAPH: result.metadata.get("target_subgraph", "unknown_subgraph"),
         ReasoningAction.UNKNOWN: "unknown",
     }
     return action_to_route.get(result.action, "unknown")
+
+
+# ========== 4. 导出 ==========
+
+__all__ = [
+    "ReasoningAction",
+    "RetrievalConfig",
+    "ReasoningResult",
+    "ReactIntentReasoner",
+    "react_reason",
+    "react_reason_async",
+    "get_route_by_reasoning"
+]

backend/app/graph/react_nodes.py

@@ -4,7 +4,10 @@ React 模式节点模块 - 带超时和重试功能
 - react_reason_node: 使用 intent.py 进行推理
 - error_handling_node: 错误处理节点
 - final_response_node: 最终回答节点
-- init_state_node: 初始化节点
+- init_state_node: 初始化状态节点
+
+注意：为了兼容 LangGraph 的同步接口，我们保留了同步的 react_reason 调用
+但内部会根据情况使用规则推理或尝试异步调用
 """
 
 import sys
@@ -27,6 +30,7 @@ from .retry_utils import (
 
 
 # ========== 1. React 推理节点 ==========
+
 def react_reason_node(state: MainGraphState) -> MainGraphState:
     """
     React 模式推理节点：判断下一步做什么
@@ -56,6 +60,7 @@ def react_reason_node(state: MainGraphState) -> MainGraphState:
     }
 
     # 使用 intent.py 进行推理
+    # 注意：这里使用同步版本，内部会根据情况处理
     result: ReasoningResult = react_reason(state.user_query, context)
 
     # 记录推理历史
@@ -84,6 +89,7 @@ def react_reason_node(state: MainGraphState) -> MainGraphState:
 
 
 # ========== 2. 错误处理节点 ==========
+
 def error_handling_node(state: MainGraphState) -> MainGraphState:
     """
     错误处理节点：处理子图/工具调用错误
@@ -93,7 +99,7 @@ def error_handling_node(state: MainGraphState) -> MainGraphState:
         "tool/node": "...",
         "status": "failed",
         "error": "...",
-        "retries_exhausted": true/false,
+        "retries_exceeded": true/false,
         "suggestion": "..."
     }
     """
@@ -113,7 +119,7 @@ def error_handling_node(state: MainGraphState) -> MainGraphState:
         "tool": error.source,
         "status": "failed",
         "error": error.error_message,
-        "retries_exhausted": error.retry_count >= error.max_retries,
+        "retries_exceeded": error.retry_count >= error.max_retries,
         "retry_count": error.retry_count,
         "max_retries": error.max_retries
     }
@@ -174,6 +180,7 @@ def error_handling_node(state: MainGraphState) -> MainGraphState:
 
 
 # ========== 3. 最终回答节点 ==========
+
 def final_response_node(state: MainGraphState) -> MainGraphState:
     """
     最终回答节点：整理并生成最终回答
@@ -217,6 +224,7 @@ def final_response_node(state: MainGraphState) -> MainGraphState:
 
 
 # ========== 4. 初始化状态节点 ==========
+
 def init_state_node(state: MainGraphState) -> MainGraphState:
     """
     初始化状态节点：在流程开始时设置初始值
@@ -234,11 +242,12 @@ def init_state_node(state: MainGraphState) -> MainGraphState:
 
 
 # ========== 5. 条件路由函数 ==========
+
 def route_by_reasoning(state: MainGraphState) -> str:
     """
     根据推理结果决定下一步路由
     
-    Returns: 路由字符串
+    Returns: 路由标识，对应 graph_builder.py 中的边
     """
     # 先检查特殊情况
     if state.current_phase == "max_steps_exceeded":
@@ -262,12 +271,13 @@ def route_by_reasoning(state: MainGraphState) -> str:
     route = get_route_by_reasoning(reasoning_result)
 
     # 映射到我们的节点名称
+    # 注意：这些名称必须与 subgraph_builder.py 中定义的节点名称一致
     route_mapping = {
         "direct_response": "final_response",
         "retrieve_rag": "rag_retrieve",
         "re_retrieve_rag": "rag_retrieve",
         "clarify": "final_response",
-        "call_tool": "final_response",
+        "call_tool": "final_response",  # 暂时映射到 final_response，后续可以扩展
         "contact": "contact_subgraph",
         "dictionary": "dictionary_subgraph",
         "news_analysis": "news_analysis_subgraph",
@@ -277,6 +287,7 @@ def route_by_reasoning(state: MainGraphState) -> str:
 
 
 # ========== 导出 ==========
+
 __all__ = [
     "init_state_node",
     "react_reason_node",