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/api/announcements/routes.py

@@ -1,9 +1,8 @@
 """公告系统 API 端点。"""
 
 from dataclasses import dataclass
-from typing import Optional
 
-from fastapi import APIRouter, Depends, HTTPException, Query, Request, status
+from fastapi import APIRouter, Depends, Query, Request
 from pydantic import ValidationError
 from sqlalchemy.orm import Session
 
@@ -12,7 +11,6 @@ from src.api.base.admin_adapter import AdminApiAdapter
 from src.api.base.authenticated_adapter import AuthenticatedApiAdapter
 from src.api.base.pipeline import ApiRequestPipeline
 from src.core.exceptions import InvalidRequestException, translate_pydantic_error
-from src.core.logger import logger
 from src.database import get_db
 from src.models.api import CreateAnnouncementRequest, UpdateAnnouncementRequest
 from src.models.database import User
@@ -251,7 +249,7 @@ class AnnouncementOptionalAuthAdapter(ApiAdapter):
         context.extra["optional_user"] = await self._resolve_optional_user(context)
         return None
 
-    async def _resolve_optional_user(self, context) -> Optional[User]:
+    async def _resolve_optional_user(self, context) -> User | None:
         if context.user:
             return context.user
 
@@ -285,7 +283,7 @@ class AnnouncementOptionalAuthAdapter(ApiAdapter):
         except Exception:
             return None
 
-    def get_optional_user(self, context) -> Optional[User]:
+    def get_optional_user(self, context) -> User | None:
         return context.extra.get("optional_user")