support hotwords for FunASR model

[AllenDou]

Hi @DarkLight1337 @Isotr0py this PR adds support for hotwords for ASR model such as FunASR, please take a look

server,
vllm serve allendou/Fun-ASR-Nano-2512-vllm -tp=2 --dtype=float32

client
python3 openai_transcription_client.py --repetition_penalty=1.0 --audio_path=/root/mary_had_lamb.wav --hotwords="hello,world"

related PR #33247

[mergify]

Documentation preview: https://vllm--39674.org.readthedocs.build/en/39674/

[gemini-code-assist]

Code Review

This pull request introduces 'hotwords' support for speech-to-text transcription, updating the OpenAI-compatible entrypoint and multiple model executors. A review comment pointed out a potential AttributeError in the shared preprocessing function when handling translation requests that lack the 'hotwords' attribute, suggesting the use of getattr for safe access.

[gemini-code-assist]

Accessing request.hotwords directly will raise an AttributeError when the request is a TranslationRequest, as the hotwords field is currently only defined in TranscriptionRequest within protocol.py. Since _preprocess_speech_to_text is shared between transcription and translation tasks, you should use getattr to safely access this field.

Suggested change

	hotwords = request.hotwords if request.hotwords else None
	hotwords = getattr(request, "hotwords", None) or None

[DarkLight1337]

Let's get #36268 merged first, then we can integrate this additional parameter

[AllenDou]

Let's get #36268 merged first, then we can integrate this additional parameter

ok