feat: enhance integration setup process with error handling and validation

app/Domains/Integration/Services/BaseIntegrationService.php

@@ -152,4 +152,16 @@ abstract class BaseIntegrationService
      * @return array
      */
     abstract public function getHeaders(): array;
+
+    /**
+     * Hook called after the integration is configured for the tenant.
+     * Can be used to validate credentials or perform initial setups.
+     * Throw an Exception on failure.
+     *
+     * @return void
+     */
+    public function onSetup(): void
+    {
+        // Override in child classes if needed
+    }
 }