sync from GitHub bf73005: refactor(backup): v5 云备份重构（方案C）+ token 刷新宽限期修复

sync from GitHub 4cf67db: refactor(backup): 重构云备份为 v5（方案 C：文件级 blob + manifest + ZIP 整包恢复）

sync from GitHub b462369: fix(database): 修复 request_log 索引引用了不存在的 status 列

sync from GitHub e499291: feat(music): 新增识曲录音归档与排查面板

sync from GitHub 8c7a6c8: feat: Enhance user backup and file management with session limits and token revocation

sync from GitHub 1727379: feat: 备份分段上传，解决 2.6MB+ 大备份 OOM 崩溃

sync from GitHub fa9256e: feat: Add user account management and enhance file handling

sync from GitHub a0d7cd9: feat: 添加用户文件管理 API 和前端页面，支持注册、登录、文件上传/下载/删除功能

sync from GitHub 7a8154c: Remove deprecated QuickApp system type definitions and associated icon file

deploy: initial release to Hugging Face Spaces