chore: 升级到 Python 3.14 并现代化代码

- 升级 Docker 基础镜像从 Python 3.12 到 3.14
- 更新 pyproject.toml 支持 Python 3.13/3.14
- 移除 Python 3.8/3.9/3.10/3.11 分类器
- 更新 black 和 mypy 配置目标版本
- 将 get_event_loop() 替换为 get_running_loop() 加上 RuntimeError 处理
- 简化 compute_cost_sync 中的 asyncio.run 使用
- Dict/List/Tuple/Set → dict/list/tuple/set (PEP 585)
- Optional[T] → T | None (PEP 604)
- Union[A, B] → A | B (PEP 604)
- 移除废弃的 typing 导入
- 移除不必要的字符串引号注解

src/middleware/plugin_middleware.py

@@ -8,7 +8,7 @@
 
 import hashlib
 import time
-from typing import TYPE_CHECKING, Optional
+from typing import TYPE_CHECKING
 
 from starlette.requests import Request
 
@@ -113,7 +113,7 @@ class PluginMiddleware:
             await send(message)
 
         # 3. 调用下游应用
-        exception_occurred: Optional[Exception] = None
+        exception_occurred: Exception | None = None
         try:
             await self.app(scope, receive, send_wrapper)
         except Exception as e:
@@ -160,7 +160,7 @@ class PluginMiddleware:
 
     def _finalize_db_session(
         self,
-        db: "Session",
+        db: Session,
         *,
         should_commit: bool,
         should_rollback: bool,
@@ -196,7 +196,7 @@ class PluginMiddleware:
                 logger.debug(f"{log_prefix}关闭数据库连接时出错（可忽略）: {close_error}")
 
     async def _cleanup_db_session(
-        self, request: Request, exception: Optional[Exception]
+        self, request: Request, exception: Exception | None
     ) -> None:
         """清理数据库会话
 
@@ -293,7 +293,7 @@ class PluginMiddleware:
 
     async def _get_rate_limit_key_and_config(
         self, request: Request
-    ) -> tuple[Optional[str], Optional[int]]:
+    ) -> tuple[str | None, int | None]:
         """
         获取速率限制的key和配置
 
@@ -344,7 +344,7 @@ class PluginMiddleware:
         # 其他端点不应用速率限制（或已在 skip_rate_limit_paths 中跳过）
         return None, None
 
-    async def _call_rate_limit_plugins(self, request: Request) -> Optional[RateLimitResult]:
+    async def _call_rate_limit_plugins(self, request: Request) -> RateLimitResult | None:
         """调用限流插件"""
 
         # 跳过不需要限流的路径（支持前缀匹配）

src/middleware/rate_limit_config.py

@@ -5,7 +5,7 @@
 """
 
 from dataclasses import dataclass
-from typing import Dict, Literal, Optional
+from typing import Literal
 
 RateLimitScope = Literal["server_ip", "user", "api_key", "skip"]
 
@@ -27,7 +27,7 @@ class RateLimitConfig:
     """
 
     # 默认策略配置
-    POLICIES: Dict[str, RateLimitPolicy] = {
+    POLICIES: dict[str, RateLimitPolicy] = {
         # 客户端 API 端点 - 服务器级别 IP 限制
         "/v1/": RateLimitPolicy(
             scope="server_ip", limit=60, description="Claude/OpenAI API 端点，服务器级别限制"
@@ -49,7 +49,7 @@ class RateLimitConfig:
     }
 
     @classmethod
-    def get_policy_for_path(cls, path: str) -> Optional[RateLimitPolicy]:
+    def get_policy_for_path(cls, path: str) -> RateLimitPolicy | None:
         """
         根据路径获取速率限制策略
 
@@ -82,6 +82,6 @@ class RateLimitConfig:
         cls.POLICIES[prefix] = policy
 
     @classmethod
-    def get_all_policies(cls) -> Dict[str, RateLimitPolicy]:
+    def get_all_policies(cls) -> dict[str, RateLimitPolicy]:
         """获取所有策略配置"""
         return cls.POLICIES.copy()