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;

src/Payment/Gateway/MockGateway.php

@@ -6,6 +6,8 @@ class MockGateway implements PaymentGatewayInterface
 {
     public function getName(): string { return 'mock'; }
 
+    public function isConfigured(): bool { return true; }
+
     public function initiate(int $amountRials, string $orderId, string $callbackUrl): PaymentInitResult
     {
         $redirectUrl = $callbackUrl . '&mock=1&ResCode=0&RefId=MOCK-' . $orderId;

src/Payment/Gateway/PaymentGatewayInterface.php

@@ -6,6 +6,11 @@ interface PaymentGatewayInterface
 {
     public function getName(): string;
 
+    /**
+     * Whether this gateway has valid credentials configured and can be offered to users.
+     */
+    public function isConfigured(): bool;
+
     /**
      * Initiates payment, returns redirect URL or token.
      */

src/Payment/Gateway/SepGateway.php

@@ -20,6 +20,11 @@ class SepGateway implements PaymentGatewayInterface
 
     public function getName(): string { return 'sep'; }
 
+    public function isConfigured(): bool
+    {
+        return $this->cfg('sep_terminal_id', $this->terminalId) !== '';
+    }
+
     private function cfg(string $key, string $envFallback): string
     {
         return $this->configRepo->get($key) ?: $envFallback;