music(pwa): PWA + 可选离线缓存全库（IndexedDB），默认关

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- vite-plugin-pwa injectManifest 模式，自定义 sw.js precache app shell
- manifest 支持加桌面 + standalone（icon 暂借 werewolf 紫色调，后续换）
- src/lib/cache.js IDB 缓存层：audio + 谱面 PNG 单 attachment id 存放，blob URL 复用
- 启动 initCache 按 localStorage 'music.cache.enabled' 决定是否后台开始下载
- 后台 worker：串行 concurrency=2 + 80ms 间隔，仅 WiFi 时跑（默认）
- audio src 优先走 IDB blob URL，没缓存才走网络
- /settings 配置页：开关 + 仅 WiFi 切换 + 进度条 + 用量/quota + 清空缓存
- topbar 加 ⚙ 按钮

默认关，首次明确 prompt-by-checkbox 才开。整库 ~1.5GB。

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Fam Zheng

2026-05-25 22:09:54 +01:00

parent bcf99ec454

commit 8991033f70

15 changed files with 5482 additions and 25 deletions

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