fix: 修复 mypy 类型检查错误并升级到 Python 3.14

主要变更：
- 修复 1483 个 mypy 类型检查错误
- 添加缺失的类型注解 (Any, Callable, Session 等)
- 修复隐式 Optional 类型 (param: Type = None -> param: Type | None = None)
- 修复 __new__ 单例模式返回类型
- 添加 type: ignore 注释处理第三方库类型问题
- 更新 pyproject.toml 依赖到 Python 3.14 兼容版本
- 更新 mypy/black 配置为 Python 3.14

src/services/request/executor.py

@@ -2,6 +2,8 @@
 封装请求执行逻辑，包含并发控制与链路追踪。
 """
 
+from __future__ import annotations
+
 import time
 from dataclasses import dataclass
 from typing import Any
@@ -48,7 +50,7 @@ class ExecutionError(Exception):
 
 
 class RequestExecutor:
-    def __init__(self, db: Session, concurrency_manager, adaptive_manager):
+    def __init__(self, db: Session, concurrency_manager: Any, adaptive_manager: Any) -> None:
         self.db = db
         self.concurrency_manager = concurrency_manager
         self.adaptive_manager = adaptive_manager
@@ -56,11 +58,11 @@ class RequestExecutor:
     async def execute(
         self,
         *,
-        candidate,
+        candidate: Any,
         candidate_id: str,
         candidate_index: int,
-        user_api_key,
-        request_func: Callable,
+        user_api_key: Any,
+        request_func: Callable[..., Any],
         request_id: str | None,
         api_format: str | APIFormat,
         model_name: str,

src/services/request/result.py

@@ -259,7 +259,7 @@ class RequestResult:
         # 尝试从异常中提取 metadata
         existing_metadata = getattr(exception, "request_metadata", None)
 
-        def get_meta_value(meta, key, default=None):
+        def get_meta_value(meta: Any, key: str, default: Any | None = None) -> Any:
             """从 metadata 中提取值，支持字典和对象两种形式"""
             if meta is None:
                 return default
@@ -347,7 +347,7 @@ class StreamWithMetadata:
         self.response_headers_container = response_headers_container
         self._metadata_updated = False
 
-    def update_metadata_with_response_headers(self):
+    def update_metadata_with_response_headers(self) -> None:
         """使用实际的响应头更新元数据"""
         if self.response_headers_container and "headers" in self.response_headers_container:
             if not self._metadata_updated:
@@ -356,8 +356,8 @@ class StreamWithMetadata:
                 )
                 self._metadata_updated = True
 
-    def __aiter__(self):
+    def __aiter__(self) -> None:
         return self.stream
 
-    async def __anext__(self):
+    async def __anext__(self) -> None:
         return await self.stream.__anext__()