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/translation/Formatter/MessageFormatterInterface.php

@@ -0,0 +1,28 @@
+<?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\Translation\Formatter;
+
+/**
+ * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
+ * @author Abdellatif Ait boudad <a.aitboudad@gmail.com>
+ */
+interface MessageFormatterInterface
+{
+    /**
+     * Formats a localized message pattern with given arguments.
+     *
+     * @param string $message    The message (may also be an object that can be cast to string)
+     * @param string $locale     The message locale
+     * @param array  $parameters An array of parameters for the message
+     */
+    public function format(string $message, string $locale, array $parameters = []): string;
+}