* feat(murf): add Murf.ai TTS support to synthAudio
Add synthMurf() following the rimelabs/cartesia pattern:
- streaming path returns a say:{vendor=murf,...} filePath consumed by the
FreeSWITCH mod_murf_tts module
- non-streaming path calls POST /v1/speech/stream (api-key header) and returns
WAV audio for cache rendering
Register murf in the supported-vendor assert list and the synth switch.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* fix(murf): drop Accept: audio/basic header (caused 406 Not Acceptable)
Murf's /v1/speech/stream rejects an unmatched Accept header with 406; the
response container is chosen by the `format` body field instead. Verified a
WAV request now returns 200 (valid RIFF/WAVE).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Hoan Luu Huu