feat(wallet): complete wallet system with admin adjust, freeze/unfreeze, activity logs
- Add Enums: TransactionType, TransactionStatus, PaymentGateway
- Migrations: wallets, wallet_transactions, wallet_activity_logs
- Models: Wallet, WalletTransaction, WalletActivityLog
- Services: WalletService with complete business logic
- Controllers: WalletController, PaymentController
- Filament Resources: WalletResource, WalletTransactionResource
- Artisan Command: ifnex:token for API token generation
- Sanctum integration with statefulApi and exception handling
- Full API endpoints: balance, transactions, admin-adjust, freeze/unfreeze
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