POST /v1/audio/speech   (Authorization: Bearer sk-...)
{"model":"tts-1","input":"你好","voice":"alloy","speed":1.0,"response_format":"mp3"}
GET  /tts?api_key=sk-...&did=设备ID&e=ms|volc&v=音色名&t=文本
volc 引擎 voice 前缀: "volc:zh_female_qingxin"