fix(update): 204 响应不通过 HTTPException 抛出，避免 Content-Length 校验失败

python-api/app/api/v1/update.py

@@ -7,7 +7,7 @@
 
 from datetime import UTC, datetime
 
-from fastapi import APIRouter, Depends, HTTPException, Query, status
+from fastapi import APIRouter, Depends, HTTPException, Query, Response, status
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -44,11 +44,11 @@ async def check_update(
     latest: AppRelease | None = result.scalar_one_or_none()
 
     if not latest:
-        raise HTTPException(status_code=status.HTTP_204_NO_CONTENT)
+        return Response(status_code=status.HTTP_204_NO_CONTENT)
 
     # 已是最新版本（或更高）
     if latest.version == version:
-        raise HTTPException(status_code=status.HTTP_204_NO_CONTENT)
+        return Response(status_code=status.HTTP_204_NO_CONTENT)
 
     # 查询对应平台的包
     result = await db.execute(
@@ -62,7 +62,7 @@ async def check_update(
 
     if not pkg:
         # 该平台无包，返回 204（避免报错阻断用户）
-        raise HTTPException(status_code=status.HTTP_204_NO_CONTENT)
+        return Response(status_code=status.HTTP_204_NO_CONTENT)
 
     # 构建 Tauri 格式的响应
     platform_key = f"{target}-{arch}"