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/Test/Constraint/ResponseHeaderLocationSame.php

@@ -0,0 +1,65 @@
+<?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\Test\Constraint;
+
+use PHPUnit\Framework\Constraint\Constraint;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+final class ResponseHeaderLocationSame extends Constraint
+{
+    public function __construct(private Request $request, private string $expectedValue)
+    {
+    }
+
+    public function toString(): string
+    {
+        return \sprintf('has header "Location" matching "%s"', $this->expectedValue);
+    }
+
+    protected function matches($other): bool
+    {
+        if (!$other instanceof Response) {
+            return false;
+        }
+
+        $location = $other->headers->get('Location');
+
+        if (null === $location) {
+            return false;
+        }
+
+        return $this->toFullUrl($this->expectedValue) === $this->toFullUrl($location);
+    }
+
+    protected function failureDescription($other): string
+    {
+        return 'the Response '.$this->toString();
+    }
+
+    private function toFullUrl(string $url): string
+    {
+        if (null === parse_url($url, \PHP_URL_PATH)) {
+            $url .= '/';
+        }
+
+        if (str_starts_with($url, '//')) {
+            return \sprintf('%s:%s', $this->request->getScheme(), $url);
+        }
+
+        if (str_starts_with($url, '/')) {
+            return $this->request->getSchemeAndHttpHost().$url;
+        }
+
+        return $url;
+    }
+}