Data Migration Tool
Use this one-time tool to migrate your existing data (menu items, categories, orders) into the new multi-store database structure. This will copy your data into a new location under `stores/store-1/`. Your original data will **not** be deleted for safety.
Warning: This is a one-time operation. Running it multiple times might duplicate data if the old collections are not cleaned up. It is safe to run if you haven't performed the migration before.