feat: 配乐改用即梦生成音频文件，双曲目可选

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- 新增 bgm/ 目录：bell.m4a（晨钟）/ valley.m4a（空山），96k AAC
- 配乐开关升级为曲 select（关/晨钟/空山），移动端走底部面板
- Web Audio 合成引擎整体移除，改 <audio> 循环 + 手动淡入淡出
- 目标音量 0.25，压在人声之下；旧布尔偏好迁移为"晨钟"
- deploy.sh 同步 bgm/ 目录；run.md 同步说明

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selfrelease

2026-10-05 12:19:52 +08:00

co-authored by Devin

parent 0b0da2d002

commit 42d5606ab5

8 changed files with 74 additions and 287 deletions

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