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/Controller/ArgumentResolver/TraceableValueResolver.php

@@ -0,0 +1,41 @@
+<?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\Controller\ArgumentResolver;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Controller\ValueResolverInterface;
+use Symfony\Component\HttpKernel\ControllerMetadata\ArgumentMetadata;
+use Symfony\Component\Stopwatch\Stopwatch;
+
+/**
+ * Provides timing information via the stopwatch.
+ *
+ * @author Iltar van der Berg <kjarli@gmail.com>
+ */
+final class TraceableValueResolver implements ValueResolverInterface
+{
+    public function __construct(
+        private ValueResolverInterface $inner,
+        private Stopwatch $stopwatch,
+    ) {
+    }
+
+    public function resolve(Request $request, ArgumentMetadata $argument): iterable
+    {
+        $method = $this->inner::class.'::'.__FUNCTION__;
+        $this->stopwatch->start($method, 'controller.argument_value_resolver');
+
+        yield from $this->inner->resolve($request, $argument);
+
+        $this->stopwatch->stop($method);
+    }
+}