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/phar-io/manifest/src/xml/ContainsElement.php

@@ -0,0 +1,31 @@
+<?php declare(strict_types = 1);
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * Copyright (c) Arne Blankerts <arne@blankerts.de>, Sebastian Heuer <sebastian@phpeople.de>, Sebastian Bergmann <sebastian@phpunit.de> and contributors
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ */
+namespace PharIo\Manifest;
+
+class ContainsElement extends ManifestElement {
+    public function getName(): string {
+        return $this->getAttributeValue('name');
+    }
+
+    public function getVersion(): string {
+        return $this->getAttributeValue('version');
+    }
+
+    public function getType(): string {
+        return $this->getAttributeValue('type');
+    }
+
+    public function getExtensionElement(): ExtensionElement {
+        return new ExtensionElement(
+            $this->getChildByName('extension')
+        );
+    }
+}