将文本转为语音并通过飞书 audio 消息发送给指定用户。用于“给用户发语音”“把这段话转语音并发飞书”“语音播报结果”等场景，尤其当普通文件发送会降级为文本时使用。仅在指定 channel=feishu 时触发。优先在需要高可达、可听播报时使用。
- Initial release of feishu-voice-tts skill. - Converts text to speech using edge-tts and sends as Feishu audio message. - Avoids file downgrade to text by following Feishu's "upload file then send audio message" workflow. - Supports customizable voice, user open_id, and flexible configuration via environment variables. - Includes a shell script for full automation of TTS, file conversion, upload, and message sending.