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/CatalogueMetadataAwareInterface.php

@@ -0,0 +1,44 @@
+<?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;
+
+/**
+ * This interface is used to get, set, and delete metadata about the Catalogue.
+ *
+ * @author Hugo Alliaume <hugo@alliau.me>
+ */
+interface CatalogueMetadataAwareInterface
+{
+    /**
+     * Gets catalogue metadata for the given domain and key.
+     *
+     * Passing an empty domain will return an array with all catalogue metadata indexed by
+     * domain and then by key. Passing an empty key will return an array with all
+     * catalogue metadata for the given domain.
+     *
+     * @return mixed The value that was set or an array with the domains/keys or null
+     */
+    public function getCatalogueMetadata(string $key = '', string $domain = 'messages'): mixed;
+
+    /**
+     * Adds catalogue metadata to a message domain.
+     */
+    public function setCatalogueMetadata(string $key, mixed $value, string $domain = 'messages'): void;
+
+    /**
+     * Deletes catalogue metadata for the given key and domain.
+     *
+     * Passing an empty domain will delete all catalogue metadata. Passing an empty key will
+     * delete all metadata for the given domain.
+     */
+    public function deleteCatalogueMetadata(string $key = '', string $domain = 'messages'): void;
+}