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/Messenger/RunCommandMessage.php

@@ -0,0 +1,36 @@
+<?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\Messenger;
+
+use Symfony\Component\Console\Exception\RunCommandFailedException;
+
+/**
+ * @author Kevin Bond <kevinbond@gmail.com>
+ */
+class RunCommandMessage implements \Stringable
+{
+    /**
+     * @param bool $throwOnFailure  If the command has a non-zero exit code, throw {@see RunCommandFailedException}
+     * @param bool $catchExceptions @see Application::setCatchExceptions()
+     */
+    public function __construct(
+        public readonly string $input,
+        public readonly bool $throwOnFailure = true,
+        public readonly bool $catchExceptions = false,
+    ) {
+    }
+
+    public function __toString(): string
+    {
+        return $this->input;
+    }
+}