feat: 完善词典子图，添加API调用和前端格式化工具

- 完善词典子图：添加生词本功能
- 创建API调用工具：dictionary_api
- 添加前端格式化展示工具：result_formatter.py
- 创建通讯录和资讯子图的基本结构
- 更新主图状态结构，添加MainGraphState
- 添加subgraph_builder.py用于子图集成

backend/app/agent_subgraphs/news_analysis/nodes.py

@@ -0,0 +1,207 @@
+"""
+资讯子图节点
+News Analysis Subgraph Nodes
+"""
+
+from typing import Dict, Any
+from datetime import datetime
+
+from .state import (
+    NewsAnalysisState,
+    NewsAction,
+    NewsItem,
+    NewsSource
+)
+
+
+def parse_intent(state: NewsAnalysisState) -> NewsAnalysisState:
+    """
+    解析用户意图节点
+    确定用户想做什么操作
+    """
+    state.current_phase = "intent_parsing"
+    
+    query_lower = state.user_query.lower()
+    
+    # 简单的关键词匹配
+    if any(keyword in query_lower for keyword in ["资讯", "新闻", "news", "report"]):
+        state.action = NewsAction.QUERY_NEWS
+    
+    elif any(keyword in query_lower for keyword in ["分析", "analyze", "url", "链接"]):
+        state.action = NewsAction.ANALYZE_URL
+    
+    elif any(keyword in query_lower for keyword in ["关键词", "keyword", "提取"]):
+        state.action = NewsAction.EXTRACT_KEYWORDS
+    
+    elif any(keyword in query_lower for keyword in ["报告", "生成", "generate"]):
+        state.action = NewsAction.GENERATE_REPORT
+    
+    else:
+        # 默认查询资讯
+        state.action = NewsAction.QUERY_NEWS
+    
+    return state
+
+
+def query_news(state: NewsAnalysisState) -> NewsAnalysisState:
+    """
+    查询资讯节点
+    """
+    state.current_phase = "querying_news"
+    
+    # TODO: 调用资讯API或爬取
+    query = state.user_query
+    
+    # 模拟返回结果
+    state.news_items = [
+        NewsItem(
+            title=f"关于 {query} 的资讯1",
+            source="Tech News",
+            summary="这是一条关于人工智能的资讯摘要...",
+            keywords=[query, "AI", "Technology"]
+        ),
+        NewsItem(
+            title=f"关于 {query} 的资讯2",
+            source="Business Daily",
+            summary="行业动态：AI在商业中的应用...",
+            keywords=[query, "Business", "Innovation"]
+        )
+    ]
+    
+    state.success = True
+    return state
+
+
+def analyze_url(state: NewsAnalysisState) -> NewsAnalysisState:
+    """
+    分析资讯URL节点
+    """
+    state.current_phase = "analyzing_url"
+    
+    # TODO: 调用URL分析API
+    urls = state.custom_urls or [state.action_params.get("url", "")]
+    
+    # 模拟返回结果
+    for url in urls:
+        if url:
+            state.news_items.append(
+                NewsItem(
+                    title=f"分析结果：{url}",
+                    source="URL Analyzer",
+                    summary="已完成对该URL的内容分析...",
+                    keywords=["News", "Analysis"]
+                )
+            )
+    
+    state.success = True
+    return state
+
+
+def extract_keywords(state: NewsAnalysisState) -> NewsAnalysisState:
+    """
+    提取关键词节点
+    """
+    state.current_phase = "extracting_keywords"
+    
+    # TODO: 调用关键词提取API
+    text = state.user_query
+    
+    # 模拟返回结果
+    state.extracted_keywords = ["AI", "大模型", "应用场景", "行业趋势"]
+    
+    state.success = True
+    return state
+
+
+def generate_report(state: NewsAnalysisState) -> NewsAnalysisState:
+    """
+    生成报告节点
+    """
+    state.current_phase = "generating_report"
+    
+    # TODO: 生成完整报告
+    query = state.user_query
+    
+    report = f"""📊 资讯分析报告
+    
+主题：{query}
+
+📋 摘要：
+这是一份关于 {query} 的资讯分析综合报告，包含最新行业动态和趋势分析。
+
+🔍 主要发现：
+1. AI技术持续快速发展
+2. 大模型应用场景不断拓展
+3. 行业数字化转型加速
+
+🏷️ 关键词：
+- AI
+- 大模型
+- 数字化转型
+- 创新
+"""
+    
+    state.report_content = report
+    state.success = True
+    return state
+
+
+def format_result(state: NewsAnalysisState) -> NewsAnalysisState:
+    """
+    格式化结果节点
+    """
+    state.current_phase = "formatting"
+    
+    if state.action == NewsAction.QUERY_NEWS and state.news_items:
+        result = "📰 最新资讯\n\n"
+        for i, item in enumerate(state.news_items, 1):
+            result += f"{i}. {item.title}\n"
+            result += f"   来源：{item.source}\n"
+            result += f"   摘要：{item.summary}\n\n"
+        
+        state.final_result = result
+    
+    elif state.action == NewsAction.ANALYZE_URL and state.news_items:
+        result = "🔍 资讯分析结果\n\n"
+        for i, item in enumerate(state.news_items, 1):
+            result += f"{i}. {item.title}\n"
+            result += f"   {item.summary}\n\n"
+        
+        state.final_result = result
+    
+    elif state.action == NewsAction.EXTRACT_KEYWORDS and state.extracted_keywords:
+        result = "🏷️ 提取的关键词\n\n"
+        result += ", ".join(state.extracted_keywords)
+        state.final_result = result
+    
+    elif state.action == NewsAction.GENERATE_REPORT and state.report_content:
+        state.final_result = state.report_content
+    
+    else:
+        if not state.final_result:
+            state.final_result = "资讯操作完成"
+    
+    state.current_phase = "done"
+    return state
+
+
+def should_continue(state: NewsAnalysisState) -> str:
+    """
+    条件路由：决定下一步该做什么
+    """
+    if state.error_message:
+        return "format_result"
+    
+    # 根据action路由
+    if state.action == NewsAction.NONE:
+        return "parse_intent"
+    elif state.action == NewsAction.QUERY_NEWS:
+        return "query_news"
+    elif state.action == NewsAction.ANALYZE_URL:
+        return "analyze_url"
+    elif state.action == NewsAction.EXTRACT_KEYWORDS:
+        return "extract_keywords"
+    elif state.action == NewsAction.GENERATE_REPORT:
+        return "generate_report"
+    else:
+        return "format_result"