feat(payment): enhance payment configuration to include active gateways and update CORS settings

src/Payment/Gateway/MellatGateway.php

@@ -21,6 +21,13 @@ class MellatGateway implements PaymentGatewayInterface
 
     public function getName(): string { return 'mellat'; }
 
+    public function isConfigured(): bool
+    {
+        return $this->cfg('mellat_terminal_id', $this->terminalId) !== ''
+            && $this->cfg('mellat_username',    $this->username)   !== ''
+            && $this->cfg('mellat_password',    $this->password)   !== '';
+    }
+
     private function cfg(string $key, string $envFallback): string
     {
         return $this->configRepo->get($key) ?: $envFallback;