feat(tts): add cf-tts module with ChatterboxTurbo backend and FastAPI service
- TTSBackend Protocol + TTSResult dataclass (audio_bytes, sample_rate, duration_s, format)
- MockTTSBackend: silent WAV clip, no GPU required, Protocol assert at import
- ChatterboxTurboBackend: ResembleAI chatterbox-turbo via chatterbox-tts package
- from_local() loads model from snapshot dir
- audio_prompt voice cloning via temp file
- _encode_audio helper: OGG (default), WAV, MP3 via torchaudio
- circuitforge_core.tts module-level synthesize() singleton (CF_TTS_MODEL / CF_TTS_MOCK)
- FastAPI app: GET /health, POST /synthesize (multipart form, returns audio bytes)
- default format: ogg (smaller than WAV, no patents)
- X-Duration-S / X-Model / X-Sample-Rate response headers
- CLI: --model --port --host --gpu-id --mock
- pyproject.toml: tts-chatterbox + tts-service extras
- Sample rate: 24000 Hz (S3GEN_SR from chatterbox internals)
pyr0ball
3075e5d3da