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/league/commonmark/src/CommonMarkConverter.php

@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
+ *  - (c) John MacFarlane
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark;
+
+use League\CommonMark\Environment\Environment;
+use League\CommonMark\Extension\CommonMark\CommonMarkCoreExtension;
+
+/**
+ * Converts CommonMark-compatible Markdown to HTML.
+ */
+final class CommonMarkConverter extends MarkdownConverter
+{
+    /**
+     * Create a new Markdown converter pre-configured for CommonMark
+     *
+     * @param array<string, mixed> $config
+     */
+    public function __construct(array $config = [])
+    {
+        $environment = new Environment($config);
+        $environment->addExtension(new CommonMarkCoreExtension());
+
+        parent::__construct($environment);
+    }
+
+    public function getEnvironment(): Environment
+    {
+        \assert($this->environment instanceof Environment);
+
+        return $this->environment;
+    }
+}