新增 migration 0021(background_key/url)、playlist/CRUD 返回 backgroundUrl、 POST .../music/{id}/background,并热更 popadmin 音乐列表背景上传;公读策略放行 perm/music/*。 Co-authored-by: Cursor <cursoragent@cursor.com>
Add HTTP /v1 MVC, TCP send path, groups with server-side member-avatar collage, object-storage upload, and friends/favorites around the architecture-v3 layout. Co-authored-by: Cursor <cursoragent@cursor.com>