Add SSE stream_format support for audio speech streaming (#4490)

Signed-off-by: syd520zy <529477025@qq.com>
Signed-off-by: faceless void <100186390+syd520zy@users.noreply.github.com>
Signed-off-by: Nick Cao <ncao@redhat.com>
Signed-off-by: Chendi Xue <chendi.xue@intel.com>
Signed-off-by: kTorp <Kristoffer.Torp@amd.com>
Signed-off-by: Junhong Liu <98734602+LJH-LBJ@users.noreply.github.com>
Signed-off-by: Hongsheng Liu <liuhongsheng4@huawei.com>
Signed-off-by: Hyoseop Song <crad_on25@naver.com>
Signed-off-by: Hyoseop Song  <crad_on25@naver.com>
Signed-off-by: amy-why-3459 <wuhaiyan17@huawei.com>
Co-authored-by: Nick Cao <ncao@redhat.com>
Co-authored-by: Chendi.Xue <chendi.xue@intel.com>
Co-authored-by: Hongsheng Liu <liuhongsheng4@huawei.com>
Co-authored-by: Kristoffer <kristoffer.torp@amd.com>
Co-authored-by: Junhong Liu <ljh_lbj@163.com>
Co-authored-by: lishunyang <lishunyang12@163.com>
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Co-authored-by: Hyoseop Song <crad_on25@naver.com>
Co-authored-by: Zhou Taichang <tzhouam@connect.ust.hk>
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Co-authored-by: amy-why-3459 <wuhaiyan17@huawei.com>

vllm_omni/entrypoints/openai/api_server.py

@@ -1200,7 +1200,7 @@ _remove_route_from_router(router, "/v1/audio/speech", {"POST"})
     "/v1/audio/speech",
     dependencies=[Depends(validate_json_request)],
     responses={
-        HTTPStatus.OK.value: {"content": {"audio/*": {}}},
+        HTTPStatus.OK.value: {"content": {"audio/*": {}, "text/event-stream": {}}},
         HTTPStatus.BAD_REQUEST.value: {"model": ErrorResponse},
         HTTPStatus.NOT_FOUND.value: {"model": ErrorResponse},
         HTTPStatus.INTERNAL_SERVER_ERROR.value: {"model": ErrorResponse},