Feature Request

Please add Fish Audio (fish.audio) as a TTS provider option alongside ElevenLabs, OpenAI, and Edge.

Why:

• Fish Audio has unique voice models not available on other platforms
• Specifically need the T-800 ENG voice (Austrian/Terminator style)
• Already have API key and voice ID ready to use

Proposed config:

{
  "messages": {
    "tts": {
      "provider": "fish",
      "fish": {
        "apiKey": "xxx",
        "voiceId": "ca16ac1b2d04465e874727560e68d9f6"
      }
    }
  }
}

Fish Audio API docs: https://docs.fish.audio/

Thank you!