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/graph/state.py

@@ -1,25 +1,75 @@
 """
-LangGraph 状态定义模块
-包含 MessagesState 和 GraphContext
+主图状态定义 - 扩展版
+Main Graph State Definition - Extended
 """
 
-import operator
-from typing import Annotated
-from typing_extensions import TypedDict
-from dataclasses import dataclass
-from langchain_core.messages import AnyMessage
+from enum import Enum, auto
+from typing import Optional, Dict, Any, Annotated, Sequence, TypedDict
+from dataclasses import dataclass, field
+from langgraph.graph import add_messages
+from langchain_core.messages import BaseMessage
 
+
+# ========== 兼容旧代码的类型 ==========
 class MessagesState(TypedDict):
-    """对话状态类型定义"""
-    messages: Annotated[list[AnyMessage], operator.add]
+    """旧的MessagesState类型（保留兼容性）"""
+    messages: Annotated[Sequence[BaseMessage], add_messages]
+
+
+class GraphContext(TypedDict):
+    """旧的GraphContext类型（保留兼容性）"""
     llm_calls: int
     memory_context: str
-    last_token_usage: dict  # 本次调用的 token 使用详情
-    last_elapsed_time: float  # 本次调用耗时（秒）
-    turns_since_last_summary: int  # 距离上次生成摘要的轮数
+    system_prompt: str
+
+
+# ========== 新的类型 ==========
+class CurrentAction(Enum):
+    """主图当前操作类型"""
+    NONE = auto()
+    GENERAL_CHAT = auto()
+    NEWS_ANALYSIS = auto()
+    DICTIONARY = auto()
+    CONTACT = auto()
+
 
 @dataclass
-class GraphContext:
-    """图执行上下文"""
-    user_id: str
-    # 可扩展更多上下文信息
+class MainGraphState:
+    """
+    主图状态 - 兼容旧代码 + 新增子图功能
+    
+    包含：
+    1. 旧代码的MessagesState兼容性字段
+    2. 主图控制字段
+    3. 子图结果占位
+    4. 用户信息
+    """
+    # ========== 兼容性字段（保留旧的MessagesState） ==========
+    messages: Annotated[Sequence[BaseMessage], add_messages] = field(default_factory=list)
+    llm_calls: int = 0
+    memory_context: str = ""
+    system_prompt: str = ""
+    
+    # ========== 主图控制字段 ==========
+    user_query: str = ""  # 用户当前查询
+    current_action: CurrentAction = CurrentAction.NONE  # 当前操作
+    intent_confidence: float = 0.0  # 意图识别置信度
+    
+    # ========== 子图结果占位 ==========
+    news_result: Optional[Dict[str, Any]] = None  # 资讯子图结果
+    dictionary_result: Optional[Dict[str, Any]] = None  # 词典子图结果
+    contact_result: Optional[Dict[str, Any]] = None  # 通讯录子图结果
+    
+    # ========== 用户信息 ==========
+    user_id: str = ""
+    
+    # ========== 执行状态 ==========
+    current_phase: str = "init"
+    error_message: str = ""
+    final_result: str = ""
+    success: bool = False
+    
+    # ========== 元数据 ==========
+    start_time: Optional[str] = None
+    end_time: Optional[str] = None
+    debug_info: Dict[str, Any] = field(default_factory=dict)