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/InvalidArgumentException.php

@@ -0,0 +1,32 @@
+<?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;
+
+/**
+ * @author Jérôme Tamarelle <jerome@tamarelle.net>
+ */
+class InvalidArgumentException extends \InvalidArgumentException implements ExceptionInterface
+{
+    /**
+     * @internal
+     */
+    public static function fromEnumValue(string $name, string $value, array|\Closure $suggestedValues): self
+    {
+        $error = \sprintf('The value "%s" is not valid for the "%s" argument.', $value, $name);
+
+        if (\is_array($suggestedValues)) {
+            $error .= \sprintf(' Supported values are "%s".', implode('", "', $suggestedValues));
+        }
+
+        return new self($error);
+    }
+}