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/Config/FileLocator.php

@@ -0,0 +1,40 @@
+<?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\Config;
+
+use Symfony\Component\Config\FileLocator as BaseFileLocator;
+use Symfony\Component\HttpKernel\KernelInterface;
+
+/**
+ * FileLocator uses the KernelInterface to locate resources in bundles.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class FileLocator extends BaseFileLocator
+{
+    public function __construct(
+        private KernelInterface $kernel,
+    ) {
+        parent::__construct();
+    }
+
+    public function locate(string $file, ?string $currentPath = null, bool $first = true): string|array
+    {
+        if (isset($file[0]) && '@' === $file[0]) {
+            $resource = $this->kernel->locateResource($file);
+
+            return $first ? $resource : [$resource];
+        }
+
+        return parent::locate($file, $currentPath, $first);
+    }
+}