refactor: 整理文件夹结构，修复 create_serde 导入问题

- 移动 main_graph/tools/ 到 deprecated/main_graph_tools/（旧架构工具）
- 移动 rag_initializer.py 和 retry_utils.py 到 core/
- 清理 main_graph/nodes/ 里的旧节点到 deprecated/
- 修复 backend.py 中 create_serde 导入问题

backend/app/deprecated/main_graph_tools/__init__.py

@@ -0,0 +1,10 @@
+"""主图工具"""
+from .graph_tools import AVAILABLE_TOOLS, TOOLS_BY_NAME
+from .subgraph_tools import SUBGRAPH_TOOLS, SUBGRAPH_TOOLS_BY_NAME
+
+__all__ = [
+    "AVAILABLE_TOOLS",
+    "TOOLS_BY_NAME",
+    "SUBGRAPH_TOOLS",
+    "SUBGRAPH_TOOLS_BY_NAME",
+]

backend/app/deprecated/main_graph_tools/common_tools.py

@@ -0,0 +1,55 @@
+"""
+公共工具模块 - 联网搜索、可视化图表等公共功能
+Common Tools Module - Web search, visualization, etc.
+"""
+
+from langchain_core.tools import tool
+from typing import Optional
+
+
+@tool
+def web_search_tool(query: str, max_results: int = 5) -> str:
+    """
+    联网搜索工具 - 无需 API Key，使用 DuckDuckGo 免费搜索
+    
+    Args:
+        query: 搜索关键词或问题
+        max_results: 返回结果数量，默认 5 条
+        
+    Returns:
+        格式化的搜索结果，包含引用溯源
+    """
+    try:
+        from backend.app.core import web_search
+        return web_search(query, max_results)
+    except Exception as e:
+        return f"联网搜索出错：{str(e)}"
+
+
+@tool
+def generate_chart_tool(data_text: str, chart_type: str = "bar") -> str:
+    """
+    可视化图表工具 - 生成 Mermaid 格式图表
+    
+    Args:
+        data_text: 图表数据文本，格式：标题,标签1:值1,标签2:值2,...
+                   示例：月度销售额,1月:100,2月:150,3月:200
+        chart_type: 图表类型，可选：bar（柱状图）、line（折线图）、pie（饼图）
+        
+    Returns:
+        格式化的图表输出（Mermaid 格式）
+    """
+    try:
+        from backend.app.core import generate_chart
+        return generate_chart(data_text, chart_type)
+    except Exception as e:
+        return f"生成图表出错：{str(e)}\n\n请使用格式：标题,标签1:值1,标签2:值2,..."
+
+
+# 公共工具列表
+COMMON_TOOLS = [
+    web_search_tool,
+    generate_chart_tool
+]
+
+COMMON_TOOLS_BY_NAME = {tool.name: tool for tool in COMMON_TOOLS}

backend/app/deprecated/main_graph_tools/graph_tools.py

@@ -0,0 +1,25 @@
+"""
+工具定义模块 - 子图工具 + RAG 工具 + 公共工具
+Subgraph Tools + RAG Tools + Common Tools
+"""
+
+# 子图工具
+from .subgraph_tools import (
+    SUBGRAPH_TOOLS,
+    SUBGRAPH_TOOLS_BY_NAME,
+    dictionary_tool,
+    news_analysis_tool,
+    contact_tool
+)
+
+# 公共工具
+from .common_tools import (
+    COMMON_TOOLS,
+    COMMON_TOOLS_BY_NAME,
+    web_search_tool,
+    generate_chart_tool
+)
+
+# 工具列表和映射（全局常量）
+AVAILABLE_TOOLS = SUBGRAPH_TOOLS.copy() + COMMON_TOOLS.copy()
+TOOLS_BY_NAME = {**SUBGRAPH_TOOLS_BY_NAME, **COMMON_TOOLS_BY_NAME}

backend/app/deprecated/main_graph_tools/subgraph_tools.py

@@ -0,0 +1,193 @@
+"""
+子图工具模块 - 将三个子图包装成 LangChain 工具
+Subgraph Tools Module - Wrap three subgraphs as LangChain tools
+"""
+
+from langchain_core.tools import tool
+from typing import Optional
+
+
+# ============== 词典子图工具 ==============
+@tool
+def dictionary_tool(query: str, action: Optional[str] = None) -> str:
+    """
+    词典/翻译工具 - 查询单词、翻译文本、提取术语、获取每日一词
+    
+    Args:
+        query: 用户查询内容（单词、句子、文本等）
+        action: 可选，指定操作类型（"query" 查询单词，"translate" 翻译，
+                "extract" 提取术语，"daily" 每日一词，不指定则自动识别）
+    
+    Returns:
+        格式化的结果文本
+    """
+    try:
+        from backend.app.subgraphs.dictionary import (
+            DictionaryState,
+            DictionaryAction,
+            parse_intent,
+            format_result
+        )
+        from backend.app.subgraphs.dictionary.nodes import (
+            query_word, translate_text, extract_terms, get_daily_word
+        )
+        
+        # 创建初始状态
+        state = DictionaryState(user_query=query, user_id="default")
+        
+        # 处理 action
+        if action == "query":
+            state.action = DictionaryAction.QUERY
+            state.action_params = {"word": query}
+            state = query_word(state)
+        elif action == "translate":
+            state.action = DictionaryAction.TRANSLATE
+            state.source_text = query
+            state = translate_text(state)
+        elif action == "daily":
+            state.action = DictionaryAction.DAILY_WORD
+            state = get_daily_word(state)
+        elif action == "extract":
+            state.action = DictionaryAction.EXTRACT
+            state.action_params = {"text": query}
+            state = extract_terms(state)
+        else:
+            # 自动解析意图
+            state = parse_intent(state)
+            if state.action == DictionaryAction.QUERY:
+                state = query_word(state)
+            elif state.action == DictionaryAction.TRANSLATE:
+                state = translate_text(state)
+            elif state.action == DictionaryAction.DAILY_WORD:
+                state = get_daily_word(state)
+            elif state.action == DictionaryAction.EXTRACT:
+                state = extract_terms(state)
+        
+        # 格式化结果
+        state = format_result(state)
+        
+        return state.final_result or "操作完成"
+        
+    except Exception as e:
+        return f"词典工具执行出错：{str(e)}"
+
+
+# ============== 资讯分析子图工具 ==============
+@tool
+def news_analysis_tool(query: str, action: Optional[str] = None) -> str:
+    """
+    资讯分析工具 - 查询新闻、分析URL、提取关键词、生成报告
+    
+    Args:
+        query: 用户查询内容（关键词、URL、文本等）
+        action: 可选，指定操作类型（"query" 查询新闻，"analyze" 分析URL，
+                "keywords" 提取关键词，"report" 生成报告，不指定则自动识别）
+    
+    Returns:
+        格式化的结果文本
+    """
+    try:
+        from backend.app.subgraphs.news_analysis import (
+            NewsAnalysisState,
+            NewsAction,
+            parse_intent,
+            format_result
+        )
+        from backend.app.subgraphs.news_analysis.nodes import (
+            query_news, analyze_url, extract_keywords, generate_report
+        )
+        
+        # 创建初始状态
+        state = NewsAnalysisState(user_query=query, user_id="default")
+        
+        # 处理 action
+        if action == "query":
+            state.action = NewsAction.QUERY_NEWS
+            state = query_news(state)
+        elif action == "analyze":
+            state.action = NewsAction.ANALYZE_URL
+            state.custom_urls = [query]
+            state = analyze_url(state)
+        elif action == "keywords":
+            state.action = NewsAction.EXTRACT_KEYWORDS
+            state = extract_keywords(state)
+        elif action == "report":
+            state.action = NewsAction.GENERATE_REPORT
+            state = generate_report(state)
+        else:
+            # 自动解析意图
+            state = parse_intent(state)
+            if state.action == NewsAction.QUERY_NEWS:
+                state = query_news(state)
+            elif state.action == NewsAction.ANALYZE_URL:
+                state.custom_urls = [query]
+                state = analyze_url(state)
+            elif state.action == NewsAction.EXTRACT_KEYWORDS:
+                state = extract_keywords(state)
+            elif state.action == NewsAction.GENERATE_REPORT:
+                state = generate_report(state)
+        
+        # 格式化结果
+        state = format_result(state)
+        
+        return state.final_result or "操作完成"
+        
+    except Exception as e:
+        return f"资讯分析工具执行出错：{str(e)}"
+
+
+# ============== 通讯录子图工具 ==============
+@tool
+def contact_tool(query: str, action: Optional[str] = None) -> str:
+    """
+    通讯录工具 - 查询联系人、添加联系人、管理通讯录
+    
+    Args:
+        query: 用户查询内容（姓名、电话、信息等）
+        action: 可选，指定操作类型（不指定则自动识别）
+    
+    Returns:
+        格式化的结果文本
+    """
+    try:
+        from backend.app.subgraphs.contact import (
+            ContactState,
+            ContactAction,
+            parse_intent,
+            format_result
+        )
+        from backend.app.subgraphs.contact.nodes import (
+            query_contact, add_contact, list_contacts
+        )
+        
+        # 创建初始状态
+        state = ContactState(user_query=query, user_id="default")
+        
+        # 自动解析意图
+        state = parse_intent(state)
+        
+        # 根据解析结果执行操作
+        if state.action == ContactAction.QUERY:
+            state = query_contact(state)
+        elif state.action == ContactAction.ADD:
+            state = add_contact(state)
+        elif state.action == ContactAction.LIST:
+            state = list_contacts(state)
+        
+        # 格式化结果
+        state = format_result(state)
+        
+        return state.final_result or "操作完成"
+        
+    except Exception as e:
+        return f"通讯录工具执行出错：{str(e)}"
+
+
+# ============== 工具列表 ==============
+SUBGRAPH_TOOLS = [
+    dictionary_tool,
+    news_analysis_tool,
+    contact_tool
+]
+
+SUBGRAPH_TOOLS_BY_NAME = {tool.name: tool for tool in SUBGRAPH_TOOLS}