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/http-kernel/Attribute/ValueResolver.php

@@ -0,0 +1,31 @@
+<?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\HttpKernel\Attribute;
+
+use Symfony\Component\HttpKernel\Controller\ValueResolverInterface;
+
+/**
+ * Defines which value resolver should be used for a given parameter.
+ */
+#[\Attribute(\Attribute::TARGET_PARAMETER | \Attribute::IS_REPEATABLE)]
+class ValueResolver
+{
+    /**
+     * @param class-string<ValueResolverInterface>|string $resolver The class name of the resolver to use
+     * @param bool                                        $disabled Whether this value resolver is disabled; this allows to enable a value resolver globally while disabling it in specific cases
+     */
+    public function __construct(
+        public string $resolver,
+        public bool $disabled = false,
+    ) {
+    }
+}