Use INSERT OR IGNORE instead of SELECT-then-INSERT for
default admin user creation, avoiding the race condition
when multiple gunicorn workers initialize simultaneously.
- Flask backend with TinyDB database
- Multi-user auth with bcrypt password hashing
- Goal CRUD with activation/deactivation and per-user limits
- Task CRUD with status tracking (todo/doing/pending/done)
- Focus rule: one doing task per goal
- Time picker-style scroll view with drag-and-drop reordering
- Admin panel for user management
- uv environment management
