music: 新建 music app，替换 piano-sheet

听歌 + 练琴曲目管理：
- 数据：piece (title/artist/category/lyrics/play_count/notes) + attachments (audio/video/pdf/image; image 带 role=chord/numbered/staff)
- 后端 axum + sqlite，附件流式落 PVC，ServeFile 支持 Range（视频拖动）
- 前端 guitar 风格 player：左 sidebar + tabs(歌词/吉他谱/简谱/五线谱/PDF/视频)，LRC 同步、快捷键、笔记自动保存
- ns cube-music + music.famzheng.me + bodylimit 5GiB
- scripts/import_guitar.py 用于把 oci /data/guitar/ 旧曲库导入

.gitea/workflows/deploy-music.yml

@@ -1,24 +1,24 @@
-name: deploy piano-sheet
-# piano.famzheng.me — 钢琴谱管理 / 阅读。host shell runner（fam 用户）。
+name: deploy music
+# music.famzheng.me — 听歌 + 练琴 曲目管理。host shell runner（fam 用户）。
 
 on:
   push:
     branches: [master]
     paths:
-      - 'apps/piano-sheet/**'
+      - 'apps/music/**'
       - 'crates/cube-core/**'
       - 'Cargo.toml'
       - 'Cargo.lock'
-      - '.gitea/workflows/deploy-piano-sheet.yml'
+      - '.gitea/workflows/deploy-music.yml'
   workflow_dispatch:
 
 jobs:
   build-and-deploy:
     runs-on: ubuntu-latest
     env:
-      APP: piano-sheet
-      NS: cube-piano
-      IMAGE: registry.famzheng.me/mochi/piano-sheet
+      APP: music
+      NS: cube-music
+      IMAGE: registry.famzheng.me/mochi/music
     steps:
       - uses: actions/checkout@v4
 
@@ -48,7 +48,7 @@ jobs:
 
       - name: Initialize K8s resources
         run: |
-          kubectl apply -f apps/piano-sheet/k8s/all.yaml
+          kubectl apply -f apps/music/k8s/all.yaml
 
       - name: Roll out to k3s
         run: |