- Introduce SQLite persistence via GORM (stored at <data>/.ushare.db)
- Add Role model with two built-in roles: admin (all perms) and user (upload only)
- Add three permissions: user_manage, upload, token_manage (reserved)
- Rewrite UserManager: DB-backed login with in-memory session tokens
- Auto-seed default roles and admin user on first startup
- Add AuthPermission middleware for fine-grained permission checks
- Add /api/uauth/me endpoint for current session info
- Add /api/admin/* CRUD routes for user and role management
- Add admin console page (/admin) with user table and role permissions view
- Show admin console link in share page for users with user_manage permission
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- Unify login page styling with share page
- Add AGENTS.md with build commands and code style guidelines
- Add dev.sh and make.sh for development and production builds
- Implement single binary build with embedded frontend using embed.FS
- Change auth configuration from CLI flag to env variables (USHARE_USERNAME, USHARE_PASSWORD)
- Set default credentials: admin / ushare@123
- Fix static file serving for SPA routes
