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/Event/RequestEvent.php

@@ -0,0 +1,56 @@
+<?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\Event;
+
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * Allows to create a response for a request.
+ *
+ * Call setResponse() to set the response that will be returned for the
+ * current request. The propagation of this event is stopped as soon as a
+ * response is set.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class RequestEvent extends KernelEvent
+{
+    private ?Response $response = null;
+
+    /**
+     * Returns the response object.
+     */
+    public function getResponse(): ?Response
+    {
+        return $this->response;
+    }
+
+    /**
+     * Sets a response and stops event propagation.
+     */
+    public function setResponse(Response $response): void
+    {
+        $this->response = $response;
+
+        $this->stopPropagation();
+    }
+
+    /**
+     * Returns whether a response was set.
+     *
+     * @psalm-assert-if-true !null $this->getResponse()
+     */
+    public function hasResponse(): bool
+    {
+        return null !== $this->response;
+    }
+}