Karakalpak TTS

Backends: omni-v2 (our fine-tune of the base, 24 kHz, GPU), omni (the earlier fine-tune), omni-base (upstream OmniVoice, untouched) and piper (22.05 kHz, CPU).

• GET /tts?text=...&backend=omni&language=kk — returns audio/wav
• language takes a name or ISO code from OmniVoice's 646; omit it for language-agnostic mode. Karakalpak is not in that list.
• POST /tts — JSON body, same fields plus generation options
• POST /normalize — inspect the text front-end
• GET /docs — OpenAPI UI
• /demo — Gradio UI (when started with --demo)