[New model] Qwen-Image-2.1 support (rebase + review follow-ups) (#8099)

Signed-off-by: NumberWan <wantszkin2003@gmail.com>
Signed-off-by: SamitHuang <285365963@qq.com>
Signed-off-by: Samit <285365963@qq.com>
Co-authored-by: Isotr0py <Isotr0py@outlook.com>
Co-authored-by: Tianyu Guo <guoty9@mail2.sysu.edu.cn>
Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: SamitHuang <285365963@qq.com>
Co-authored-by: Gao Han <hgaoaf@connect.ust.hk>

vllm_omni/entrypoints/openai/api_server.py

@@ -2279,6 +2279,7 @@ async def generate_images(
 
 @router.post(
     "/v1/images/edits",
+    response_model=None,
     responses={
         HTTPStatus.OK.value: {"model": ImageGenerationResponse},
         HTTPStatus.BAD_REQUEST.value: {"model": ErrorResponse},
@@ -2286,6 +2287,7 @@ async def generate_images(
         HTTPStatus.INTERNAL_SERVER_ERROR.value: {"model": ErrorResponse},
     },
 )
+@with_cancellation
 async def edit_images(
     raw_request: Request,
     image: list[UploadFile] | None = File(None),