Add feature tests for domain order management

- Implement AdminDomainOrderTest to cover admin functionalities for domain orders including listing, confirming registration, KYC updates, activation, rejection, and refunds.
- Implement ClientDomainOrderTest to cover client functionalities for placing domain orders, including validation for balance, duplicate orders, and domain normalization.
- Ensure proper handling of domain pricing and service statuses throughout the tests.

app/Models/Service.php

@@ -28,6 +28,7 @@ class Service extends Model
         'expires_at'   => 'datetime',
         'suspended_at' => 'datetime',
         'cancelled_at' => 'datetime',
+        'refunded_at'  => 'datetime',
         'retry_requested_at' => 'datetime',
     ];