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-foundation/RequestMatcher/HeaderRequestMatcher.php

@@ -0,0 +1,52 @@
+<?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\HttpFoundation\RequestMatcher;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestMatcherInterface;
+
+/**
+ * Checks the presence of HTTP headers in a Request.
+ *
+ * @author Alexandre Daubois <alex.daubois@gmail.com>
+ */
+class HeaderRequestMatcher implements RequestMatcherInterface
+{
+    /**
+     * @var string[]
+     */
+    private array $headers;
+
+    /**
+     * @param string[]|string $headers A header or a list of headers
+     *                                 Strings can contain a comma-delimited list of headers
+     */
+    public function __construct(array|string $headers)
+    {
+        $this->headers = array_reduce((array) $headers, static fn (array $headers, string $header) => array_merge($headers, preg_split('/\s*,\s*/', $header)), []);
+    }
+
+    public function matches(Request $request): bool
+    {
+        if (!$this->headers) {
+            return true;
+        }
+
+        foreach ($this->headers as $header) {
+            if (!$request->headers->has($header)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+}