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/console/Exception/RunCommandFailedException.php

@@ -0,0 +1,29 @@
+<?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\Console\Exception;
+
+use Symfony\Component\Console\Messenger\RunCommandContext;
+
+/**
+ * @author Kevin Bond <kevinbond@gmail.com>
+ */
+final class RunCommandFailedException extends RuntimeException
+{
+    public function __construct(\Throwable|string $exception, public readonly RunCommandContext $context)
+    {
+        parent::__construct(
+            $exception instanceof \Throwable ? $exception->getMessage() : $exception,
+            $exception instanceof \Throwable ? $exception->getCode() : 0,
+            $exception instanceof \Throwable ? $exception : null,
+        );
+    }
+}