-- Lesson MP3 public URL for device DOWNLOAD / UPDATE_MANIFEST.

DELETE FROM `sys_params` WHERE `param_code` = 'server.lesson_audio_public_url';
INSERT INTO `sys_params` (`id`, `param_code`, `param_value`, `value_type`, `param_type`, `remark`) VALUES
(317, 'server.lesson_audio_public_url', 'https://xiaozhi.illegalfm.com/lesson-audio', 'string', 1, '设备下载课文 MP3 的公网根（Caddy /lesson-audio* → 内网 8003）；磁盘 data/lesson_audio/{org_id}/，空机构 default_org');