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/mailer/Test/TransportFactoryTestCase.php

@@ -0,0 +1,67 @@
+<?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\Mailer\Test;
+
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\HttpClient\MockHttpClient;
+use Symfony\Component\Mailer\Transport\Dsn;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
+use Symfony\Contracts\HttpClient\HttpClientInterface;
+
+/**
+ * A test case to ease testing Transport Factory.
+ *
+ * @author Konstantin Myakshin <molodchick@gmail.com>
+ *
+ * @deprecated since Symfony 7.2, use AbstractTransportFactoryTestCase instead
+ */
+abstract class TransportFactoryTestCase extends AbstractTransportFactoryTestCase
+{
+    use IncompleteDsnTestTrait;
+
+    protected EventDispatcherInterface $dispatcher;
+    protected HttpClientInterface $client;
+    protected LoggerInterface $logger;
+
+    /**
+     * @psalm-return iterable<array{0: Dsn, 1?: string|null}>
+     */
+    public static function unsupportedSchemeProvider(): iterable
+    {
+        return [];
+    }
+
+    /**
+     * @psalm-return iterable<array{0: Dsn}>
+     */
+    public static function incompleteDsnProvider(): iterable
+    {
+        return [];
+    }
+
+    protected function getDispatcher(): EventDispatcherInterface
+    {
+        return $this->dispatcher ??= new EventDispatcher();
+    }
+
+    protected function getClient(): HttpClientInterface
+    {
+        return $this->client ??= new MockHttpClient();
+    }
+
+    protected function getLogger(): LoggerInterface
+    {
+        return $this->logger ??= new NullLogger();
+    }
+}