#23102 [Feature]: add support for vLLM realtime endpoint
### Check for existing issues
- [x] I have searched the existing issues and checked that my issue is not a duplicate.
### The Feature
vLLM supports `/v1/realtime` https://docs.vllm.ai/en/latest/serving/openai_compatible_server/?h=realtime#realtime-api
📝 Workaround so far is to setup provider **OpenAI** with custom model and custom endpoint.
### Motivation, pitch
Goal is to setup Voxtral Realtime model https://huggingface.co/mistralai/Voxtral-Mini-4B-Realtime-2602
### What part of LiteLLM is this about?
SDK (litellm Python package)
### LiteLLM is hiring a founding backend engineer, are you interested in joining us and shipping to all our users?
No
### Twitter / LinkedIn details
_No response_