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/dictionary/state.py

@@ -0,0 +1,95 @@
+"""
+词典子图状态定义
+Dictionary Subgraph State Definition
+"""
+
+from enum import Enum, auto
+from typing import Optional, Dict, List, Any
+from dataclasses import dataclass, field
+
+
+class DictionaryAction(Enum):
+    """词典操作类型"""
+    NONE = auto()
+    QUERY = auto()  # 查询单词
+    TRANSLATE = auto()  # 翻译文本
+    EXTRACT = auto()  # 提取专业术语
+    DAILY_WORD = auto()  # 每日一词
+    WORD_BOOK_LOOKUP = auto()  # 生词本查询
+    WORD_BOOK_ADD = auto()  # 添加到生词本
+
+
+@dataclass
+class WordEntry:
+    """单词词条"""
+    word: str = ""
+    phonetic: str = ""  # 音标
+    part_of_speech: str = ""  # 词性
+    definitions: List[str] = field(default_factory=list)  # 释义
+    examples: List[str] = field(default_factory=list)  # 例句
+    synonyms: List[str] = field(default_factory=list)  # 同义词
+    antonyms: List[str] = field(default_factory=list)  # 反义词
+    source_language: str = "en"  # 源语言
+    target_language: str = "zh"  # 目标语言
+    in_word_book: bool = False  # 是否在生词本
+    review_count: int = 0  # 复习次数
+    next_review_at: Optional[str] = None  # 下次复习时间
+    created_at: Optional[str] = None
+    metadata: Dict[str, Any] = field(default_factory=dict)
+
+
+@dataclass
+class ExtractedTerm:
+    """提取的术语"""
+    term: str = ""
+    type: str = ""  # 技术术语、医学术语等
+    definition: str = ""
+    context: str = ""
+    confidence: float = 0.0
+    metadata: Dict[str, Any] = field(default_factory=dict)
+
+
+@dataclass
+class DictionaryState:
+    """词典子图状态"""
+    # ========== 输入 ==========
+    user_query: str = ""  # 用户查询
+    user_id: str = ""  # 用户ID
+    
+    # 操作控制
+    action: DictionaryAction = DictionaryAction.NONE
+    action_params: Dict[str, Any] = field(default_factory=dict)
+    
+    # 翻译专用
+    source_text: str = ""
+    source_language: str = "auto"  # auto, en, zh, etc.
+    target_language: str = "zh"  # 默认翻译成中文
+    
+    # ========== 执行过程 ==========
+    current_phase: str = "init"  # init, querying, extracting, done
+    
+    # 查询结果
+    word_entry: Optional[WordEntry] = None
+    
+    # 翻译结果
+    translated_text: str = ""
+    translation_confidence: float = 0.0
+    
+    # 提取结果
+    extracted_terms: List[ExtractedTerm] = field(default_factory=list)
+    
+    # 每日一词
+    daily_word: Optional[WordEntry] = None
+    daily_word_context: 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)