[Refactor] [6/N] to simplify the vLLM openai chat_completion serving architecture (#32240)

Signed-off-by: chaunceyjiang <chaunceyjiang@gmail.com>

vllm/reasoning/hunyuan_a13b_reasoning_parser.py

@@ -6,7 +6,10 @@ from collections.abc import Sequence
 import regex as re
 from transformers import PreTrainedTokenizerBase
 
-from vllm.entrypoints.openai.protocol import ChatCompletionRequest, DeltaMessage
+from vllm.entrypoints.openai.chat_completion.protocol import (
+    ChatCompletionRequest,
+)
+from vllm.entrypoints.openai.engine.protocol import DeltaMessage
 from vllm.logger import init_logger
 from vllm.reasoning import ReasoningParser