karaoke(app): port single-device playlist from partiverse + tests

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点歌单本地管理 — 添加/上移/下移/置顶/删除 + 10 秒撤销倒计时 + YouTube 一键
搜，无 room / 无 ws。删掉了 partiverse 那套 yopu 和弦抓取 / LLM 聊天点歌 /
QR 码（依赖后端，对单机无意义）。logic 全 immutable，21 个 vitest 覆盖
边界（首位上移 noop / 末位下移 noop / 缺失 id / 不变性）。

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Fam Zheng

2026-05-14 15:32:22 +01:00

parent 78f84d4225

commit fbd6e3cb9c

8 changed files with 3414 additions and 0 deletions

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apps/karaoke/frontend/package-lock.json

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