Implement the core logic for applying discount codes during price
calculation and introduce the WalletService. This includes updating
the PriceCalculatorService to validate and apply discounts,
incrementing usage counts, and adding a Filament resource for
managing discount codes via the admin panel.
Additionally, refactor TrackingDataImport to use OnEachRow for better
memory management during large Excel imports.
Add database migrations and Eloquent models to support user wallets,
transaction history, and discount code functionality. Includes a
one-to-one relationship between User and Wallet.
