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/DataCollector/ExceptionDataCollector.php

@@ -0,0 +1,68 @@
+<?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\DataCollector;
+
+use Symfony\Component\ErrorHandler\Exception\FlattenException;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @final
+ */
+class ExceptionDataCollector extends DataCollector
+{
+    public function collect(Request $request, Response $response, ?\Throwable $exception = null): void
+    {
+        if (null !== $exception) {
+            $this->data = [
+                'exception' => FlattenException::createWithDataRepresentation($exception),
+            ];
+        }
+    }
+
+    public function hasException(): bool
+    {
+        return isset($this->data['exception']);
+    }
+
+    public function getException(): \Exception|FlattenException
+    {
+        return $this->data['exception'];
+    }
+
+    public function getMessage(): string
+    {
+        return $this->data['exception']->getMessage();
+    }
+
+    public function getCode(): int
+    {
+        return $this->data['exception']->getCode();
+    }
+
+    public function getStatusCode(): int
+    {
+        return $this->data['exception']->getStatusCode();
+    }
+
+    public function getTrace(): array
+    {
+        return $this->data['exception']->getTrace();
+    }
+
+    public function getName(): string
+    {
+        return 'exception';
+    }
+}