fix：修复代码兼容性写法

app/api/endpoints/download.py

@@ -1,4 +1,4 @@
-from typing import Any, List
+from typing import Any, List, Annotated
 
 from fastapi import APIRouter, Depends, Body
 
@@ -30,8 +30,8 @@ def current(
 def download(
         media_in: schemas.MediaInfo,
         torrent_in: schemas.TorrentInfo,
-        downloader: str = Body(None),
-        save_path: str = Body(None),
+        downloader: Annotated[str | None, Body()] = None,
+        save_path: Annotated[str | None, Body()] = None,
         current_user: User = Depends(get_current_active_user)) -> Any:
     """
     添加下载任务（含媒体信息）
@@ -62,8 +62,8 @@ def download(
 @router.post("/add", summary="添加下载（不含媒体信息）", response_model=schemas.Response)
 def add(
         torrent_in: schemas.TorrentInfo,
-        downloader: str = Body(None),
-        save_path: str = Body(None),
+        downloader: Annotated[str | None, Body()] = None,
+        save_path: Annotated[str | None, Body()] = None,
         current_user: User = Depends(get_current_active_user)) -> Any:
     """
     添加下载任务（不含媒体信息）