rebase: adapt to vLLM v0.29 APIs

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

tests/entrypoints/openai_api/test_modality_validation.py

@@ -13,7 +13,7 @@ from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 from vllm.entrypoints.openai.chat_completion.protocol import ChatCompletionRequest
-from vllm.entrypoints.openai.engine.protocol import ErrorResponse
+from vllm.entrypoints.serve.engine.protocol import ErrorResponse
 
 pytestmark = [pytest.mark.core_model, pytest.mark.cpu]