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/BackedEnumValueResolver.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\Controller\ArgumentResolver;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Controller\ValueResolverInterface;
+use Symfony\Component\HttpKernel\ControllerMetadata\ArgumentMetadata;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+
+/**
+ * Attempt to resolve backed enum cases from request attributes, for a route path parameter,
+ * leading to a 404 Not Found if the attribute value isn't a valid backing value for the enum type.
+ *
+ * @author Maxime Steinhausser <maxime.steinhausser@gmail.com>
+ */
+final class BackedEnumValueResolver implements ValueResolverInterface
+{
+    public function resolve(Request $request, ArgumentMetadata $argument): iterable
+    {
+        if (!is_subclass_of($argument->getType(), \BackedEnum::class)) {
+            return [];
+        }
+
+        if ($argument->isVariadic()) {
+            // only target route path parameters, which cannot be variadic.
+            return [];
+        }
+
+        // do not support if no value can be resolved at all
+        // letting the \Symfony\Component\HttpKernel\Controller\ArgumentResolver\DefaultValueResolver be used
+        // or \Symfony\Component\HttpKernel\Controller\ArgumentResolver fail with a meaningful error.
+        if (!$request->attributes->has($argument->getName())) {
+            return [];
+        }
+
+        $value = $request->attributes->get($argument->getName());
+
+        if (null === $value) {
+            return [null];
+        }
+
+        if ($value instanceof \BackedEnum) {
+            return [$value];
+        }
+
+        if (!\is_int($value) && !\is_string($value)) {
+            throw new \LogicException(\sprintf('Could not resolve the "%s $%s" controller argument: expecting an int or string, got "%s".', $argument->getType(), $argument->getName(), get_debug_type($value)));
+        }
+
+        /** @var class-string<\BackedEnum> $enumType */
+        $enumType = $argument->getType();
+
+        try {
+            return [$enumType::from($value)];
+        } catch (\ValueError|\TypeError $e) {
+            throw new NotFoundHttpException(\sprintf('Could not resolve the "%s $%s" controller argument: ', $argument->getType(), $argument->getName()).$e->getMessage(), $e);
+        }
+    }
+}