Mark Backman c091232f2f Add xAI streaming STT service ...

New `XAISTTService` wraps xAI's real-time speech-to-text WebSocket
(`wss://api.x.ai/v1/stt`). It extends `WebsocketSTTService`, authenticates
with the `XAI_API_KEY` as a Bearer token on the WS handshake, and streams
raw audio (PCM/mu-law/A-law) with configurable interim results, endpointing,
language, multichannel, and diarization settings.

- `src/pipecat/services/xai/stt.py`: new service, settings dataclass, and
  `language_to_xai_stt_language` helper.
- `src/pipecat/services/stt_latency.py`: `XAI_TTFS_P99` default.
- `pyproject.toml` / `uv.lock`: `xai` extra now pulls in `websockets-base`.
- `README.md`: link to xAI STT in the services table.
- `examples/voice/voice-xai.py`: swap DeepgramSTTService for XAISTTService so
  the xAI voice example is fully xAI.
- `examples/transcription/transcription-xai.py`: new transcription-only
  example using the new service.

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..

voice-aicoustics.py

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voice-assemblyai-turn-detection.py

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voice-assemblyai.py

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voice-asyncai-http.py

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voice-asyncai.py

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voice-aws-strands.py

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voice-aws.py

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voice-azure-http.py

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voice-azure.py

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voice-camb.py

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voice-cartesia-http.py

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voice-cartesia.py

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voice-deepgram-flux-sagemaker.py

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voice-deepgram-flux.py

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voice-deepgram-http.py

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voice-deepgram-sagemaker.py

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voice-deepgram-vad.py

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voice-deepgram.py

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voice-elevenlabs-http.py

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voice-elevenlabs.py

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voice-fal.py

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voice-fish.py

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voice-gladia-vad.py

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voice-gladia.py

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voice-google-audio-in.py

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voice-google-gemini-tts.py

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voice-google-http.py

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voice-google-image.py

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voice-google.py

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voice-gradium.py

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voice-groq.py

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voice-hume.py

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voice-inworld-http.py

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voice-inworld.py

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voice-kokoro.py

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voice-krisp-viva.py

VIVA SDK TT v3 support (#4252)

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voice-langchain.py

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voice-lmnt.py

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voice-minimax.py

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voice-mistral.py

Add Mistral Voxtral Realtime STT service

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voice-neuphonic-http.py

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voice-neuphonic.py

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voice-nvidia.py

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voice-openai-http.py

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voice-openai-responses-http.py

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voice-openai-responses.py

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voice-openai.py

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voice-piper.py

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voice-resemble.py

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voice-rime-http.py

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voice-rime.py

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voice-sarvam-http.py

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voice-sarvam.py

Remove allow_interruptions from voice-sarvam example

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voice-smallest.py

feat: add Smallest AI STT service integration (#4162)

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voice-soniox.py

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voice-speechmatics-vad.py

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voice-speechmatics.py

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voice-xai.py

Add xAI streaming STT service

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voice-xtts.py

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