refactor: 统一使用现代类型注解替代传统类型注解

- 将 Dict、List 等传统类型注解替换为 dict、list 等现代类型注解
- 更新类型注解以更精确地反映变量类型
- 修复部分类型注解与实际使用不匹配的问题
- 优化部分代码逻辑以提高类型安全性

orchestrator/agent.py

@@ -97,18 +97,18 @@ class OrchestrationAgent:
             base_url=OPENAI_BASE_URL,
             api_key=OPENAI_API_KEY,
             model=OPENAI_MODEL,
-            temperature=0.0,
+            temperature=0.1,
         )
         self._llm_with_tools = llm.bind_tools(TOOLS)
 
         # user_id -> list[BaseMessage]
-        self._history: Dict[str, List[BaseMessage]] = defaultdict(list)
+        self._history: dict[str, list[BaseMessage]] = defaultdict(list)
         # user_id -> most recently active conv_id
-        self._active_conv: Dict[str, Optional[str]] = defaultdict(lambda: None)
+        self._active_conv: dict[str, Optional[str]] = defaultdict(lambda: None)
         # user_id -> asyncio.Lock (prevents concurrent processing per user)
-        self._user_locks: Dict[str, asyncio.Lock] = defaultdict(asyncio.Lock)
+        self._user_locks: dict[str, asyncio.Lock] = defaultdict(asyncio.Lock)
         # user_id -> passthrough mode enabled
-        self._passthrough: Dict[str, bool] = defaultdict(lambda: False)
+        self._passthrough: dict[str, bool] = defaultdict(lambda: False)
 
     def _build_system_prompt(self, user_id: str) -> str:
         conv_id = self._active_conv[user_id]
@@ -173,7 +173,7 @@ class OrchestrationAgent:
             response = await llm_no_tools.ainvoke([HumanMessage(content=qa_prompt)])
             return response.content or ""
 
-        messages: List[BaseMessage] = (
+        messages: list[BaseMessage] = (
             [SystemMessage(content=self._build_system_prompt(user_id))]
             + self._history[user_id]
             + [HumanMessage(content=text)]