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/user/apikey.py

@@ -2,6 +2,8 @@
 API密钥管理服务
 """
 
+from __future__ import annotations
+
 from datetime import datetime, timedelta, timezone
 from typing import Any
 
@@ -124,7 +126,7 @@ class ApiKeyService:
         return query.order_by(ApiKey.created_at.desc()).all()
 
     @staticmethod
-    def update_api_key(db: Session, key_id: str, **kwargs) -> ApiKey | None:  # UUID
+    def update_api_key(db: Session, key_id: str, **kwargs: Any) -> ApiKey | None:  # UUID
         """更新API密钥"""
         api_key = db.query(ApiKey).filter(ApiKey.id == key_id).first()
         if not api_key:

src/services/user/preference.py

@@ -3,6 +3,8 @@
 """
 
 
+from __future__ import annotations
+
 from sqlalchemy.orm import Session
 
 from src.core.exceptions import NotFoundException

src/services/user/service.py

@@ -2,6 +2,8 @@
 用户管理服务
 """
 
+from __future__ import annotations
+
 import asyncio
 from datetime import datetime, timezone
 from typing import Any
@@ -176,7 +178,7 @@ class UserService:
 
     @staticmethod
     @transactional()
-    def update_user(db: Session, user_id: str, **kwargs) -> User | None:
+    def update_user(db: Session, user_id: str, **kwargs: Any) -> User | None:
         """更新用户信息"""
         user = db.query(User).filter(User.id == user_id).first()
         if not user: