Features:
- Add admin reset-password command to reset user passwords
- Support SQLite, PostgreSQL, and MySQL databases
- Use scrypt hashing compatible with CodiMD
- Update README with reset-password usage examples
Features:
- Add admin command group for database operations
- admin list-users: List all users from SQLite/PostgreSQL/MySQL
- admin user-notes: List notes for specific user
- Add CodiMDDatabase class for direct DB access
