feat: add PCM streaming + Kokoro voice name support
- POST /audio/speech with response_format=pcm now streams raw 16-bit
PCM (24kHz mono) via Flask generator — compatible with customtts
extension streaming mode
- resolve_voice() handles:
* Standard OpenAI names (alloy, echo, ...)
* Kokoro blend syntax: 'af_bella+bf_emma+af_nicole' (picks first)
* Kokoro prefix heuristic: af_/bf_/am_/bm_ → Ryan, zf_/zm_ → Vivian
* Explicit Kokoro aliases for common voices (bella, emma, sky, etc.)
* Graceful fallback to alloy for unknown voices
- app.run(threaded=True) to support concurrent streaming connections
pi-bot-01
fef6a1b74c