rebase: adapt to vLLM v0.29 APIs

Signed-off-by: tzhouam <tzhouam@connect.ust.hk>

tests/entrypoints/openai_api/test_serving_speech.py

@@ -25,7 +25,7 @@ from fastapi.responses import JSONResponse
 from fastapi.testclient import TestClient
 from pydantic import ValidationError
 from pytest_mock import MockerFixture
-from vllm.entrypoints.openai.engine.protocol import ErrorInfo, ErrorResponse
+from vllm.entrypoints.serve.engine.protocol import ErrorInfo, ErrorResponse
 
 from vllm_omni.diffusion.request import OmniDiffusionRequest
 from vllm_omni.diffusion.sched.request_scheduler import RequestScheduler