lots of improvements

shared/lib/Mail/Service/ServiceConfigurableInterface.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace KTXF\Mail\Service;
+
+use KTXF\Resource\Provider\ResourceServiceConfigureInterface;
+
+/**
+ * Mail Service Mutable Interface
+ * 
+ * Extends base service interface with setter methods for mutable properties.
+ * Used for service configuration and updates.
+ * 
+ * @since 2025.05.01
+ */
+interface ServiceConfigurableInterface extends ServiceMutableInterface, ResourceServiceConfigureInterface {
+
+	public const JSON_TYPE = ServiceBaseInterface::JSON_TYPE;
+
+}