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/contact/state.py

@@ -0,0 +1,104 @@
+"""
+通讯录子图状态定义
+Contact Subgraph State Definition
+"""
+
+from enum import Enum, auto
+from typing import Optional, Dict, List, Any
+from dataclasses import dataclass, field
+
+
+class ContactAction(Enum):
+    """通讯录操作类型"""
+    NONE = auto()
+    CONTACT_LIST = auto()  # 联系人列表
+    CONTACT_ADD = auto()  # 添加联系人
+    CONTACT_UPDATE = auto()  # 更新联系人
+    CONTACT_DELETE = auto()  # 删除联系人
+    EMAIL_LIST = auto()  # 邮件列表
+    EMAIL_READ = auto()  # 读取邮件
+    EMAIL_SEND = auto()  # 发送邮件
+    SNIFF_CONTACTS = auto()  # 智能嗅探
+
+
+@dataclass
+class Contact:
+    """联系人数据结构"""
+    id: Optional[str] = None
+    name: str = ""
+    phone: str = ""
+    email: str = ""
+    company: str = ""
+    position: str = ""
+    notes: str = ""
+    created_at: Optional[str] = None
+    updated_at: Optional[str] = None
+    metadata: Dict[str, Any] = field(default_factory=dict)
+
+
+@dataclass
+class Email:
+    """邮件数据结构"""
+    id: Optional[str] = None
+    subject: str = ""
+    sender: str = ""
+    recipients: List[str] = field(default_factory=list)
+    date: Optional[str] = None
+    body: str = ""
+    is_read: bool = False
+    mailbox: str = ""
+    metadata: Dict[str, Any] = field(default_factory=dict)
+
+
+@dataclass
+class ContactState:
+    """通讯录子图状态"""
+    # ========== 输入 ==========
+    user_query: str = ""  # 用户查询
+    user_id: str = ""  # 用户ID
+    
+    # 操作控制
+    action: ContactAction = ContactAction.NONE
+    action_params: Dict[str, Any] = field(default_factory=dict)
+    
+    # ========== 执行过程 ==========
+    # 当前阶段
+    current_phase: str = "init"  # init, processing, reviewing, done
+    
+    # 联系人相关
+    contacts: List[Contact] = field(default_factory=list)
+    current_contact: Optional[Contact] = None
+    
+    # 邮件相关
+    emails: List[Email] = field(default_factory=list)
+    current_email: Optional[Email] = None
+    
+    # 邮件草稿（用于审核）
+    draft_subject: str = ""
+    draft_recipient: str = ""
+    draft_body: str = ""
+    
+    # ========== 人工审核相关 ==========
+    pending_review: bool = False
+    review_type: str = ""  # email_send, contact_delete
+    review_prompt: str = ""
+    review_approved: Optional[bool] = None
+    review_comment: str = ""
+    review_modified_content: str = ""
+    
+    # ========== 智能嗅探 ==========
+    sniff_result: Optional[Dict[str, Any]] = None
+    sniffed_contacts: List[Contact] = field(default_factory=list)
+    sniff_confirmation_pending: bool = False
+    
+    # ========== 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)