Stand: SMTP-Test, Admin-Mail-Tab, Notifiable-Fix, Lazy-Quill

- Fix: Notifiable-Trait zum User-Model hinzugefuegt (behebt notify()-500er)
- Installer: SMTP-Verbindungstest mit EsmtpTransport + Ueberspringen-Link
- Admin: Neuer E-Mail-Tab mit SMTP-Konfiguration + Verbindungstest
- Admin: Lazy Quill-Initialisierung (nur sichtbare Locale wird geladen)
- Uebersetzungen: 17 neue Mail-Keys in allen 6 Sprachen

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vendor/symfony/event-dispatcher/Attribute/AsEventListener.php

@@ -0,0 +1,35 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\EventDispatcher\Attribute;
+
+/**
+ * Service tag to autoconfigure event listeners.
+ *
+ * @author Alexander M. Turek <me@derrabus.de>
+ */
+#[\Attribute(\Attribute::TARGET_CLASS | \Attribute::TARGET_METHOD | \Attribute::IS_REPEATABLE)]
+class AsEventListener
+{
+    /**
+     * @param string|null $event      The event name to listen to
+     * @param string|null $method     The method to run when the listened event is triggered
+     * @param int         $priority   The priority of this listener if several are declared for the same event
+     * @param string|null $dispatcher The service id of the event dispatcher to listen to
+     */
+    public function __construct(
+        public ?string $event = null,
+        public ?string $method = null,
+        public int $priority = 0,
+        public ?string $dispatcher = null,
+    ) {
+    }
+}