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/state.py

@@ -0,0 +1,89 @@
+"""
+资讯子图状态定义
+News Analysis Subgraph State Definition
+"""
+
+from enum import Enum, auto
+from typing import Optional, Dict, List, Any
+from dataclasses import dataclass, field
+
+
+class NewsAction(Enum):
+    """资讯操作类型"""
+    NONE = auto()
+    QUERY_NEWS = auto()  # 查询资讯
+    ANALYZE_URL = auto()  # 分析资讯
+    GENERATE_REPORT = auto()  # 生成报告
+    FETCH_FROM_SOURCES = auto()  # 从指定源获取
+    EXTRACT_KEYWORDS = auto()  # 提取关键词
+
+
+@dataclass
+class NewsItem:
+    """资讯条目"""
+    title: str = ""
+    url: str = ""
+    source: str = ""
+    content: str = ""
+    author: str = ""
+    published_at: Optional[str] = None
+    summary: str = ""
+    keywords: List[str] = field(default_factory=list)
+    sentiment: float = 0.0  # 情感分析得分
+    metadata: Dict[str, Any] = field(default_factory=dict)
+
+
+@dataclass
+class NewsSource:
+    """资讯源"""
+    name: str = ""
+    url: str = ""
+    type: str = ""  # rss, website, api
+    enabled: bool = True
+    last_fetched_at: Optional[str] = None
+    metadata: Dict[str, Any] = field(default_factory=dict)
+
+
+@dataclass
+class NewsAnalysisState:
+    """资讯子图状态"""
+    # ========== 输入 ==========
+    user_query: str = ""  # 用户查询
+    user_id: str = ""  # 用户ID
+    
+    # 操作控制
+    action: NewsAction = NewsAction.NONE
+    action_params: Dict[str, Any] = field(default_factory=dict)
+    
+    # 源配置
+    use_follow_list: bool = False
+    custom_urls: List[str] = field(default_factory=list)
+    
+    # ========== 执行过程 ==========
+    current_phase: str = "init"  # init, fetching, analyzing, done
+    current_source_index: int = 0
+    primary_fetched: bool = False
+    
+    # 源列表
+    sources: List[NewsSource] = field(default_factory=list)
+    
+    # 资讯条目
+    news_items: List[NewsItem] = field(default_factory=list)
+    
+    # 关键词
+    extracted_keywords: List[str] = field(default_factory=list)
+    
+    # 报告
+    report_content: str = ""
+    
+    # ========== 结果 ==========
+    success: bool = False
+    error_message: str = ""
+    final_result: str = ""
+    result_data: Dict[str, Any] = field(default_factory=dict)
+    
+    # ========== 元数据 ==========
+    start_time: Optional[str] = None
+    end_time: Optional[str] = None
+    duration: float = 0.0
+    debug_info: Dict[str, Any] = field(default_factory=dict)