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/error-handler/ErrorRenderer/CliErrorRenderer.php

@@ -0,0 +1,46 @@
+<?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\ErrorHandler\ErrorRenderer;
+
+use Symfony\Component\ErrorHandler\Exception\FlattenException;
+use Symfony\Component\VarDumper\Cloner\VarCloner;
+use Symfony\Component\VarDumper\Dumper\CliDumper;
+
+// Help opcache.preload discover always-needed symbols
+class_exists(CliDumper::class);
+
+/**
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class CliErrorRenderer implements ErrorRendererInterface
+{
+    public function render(\Throwable $exception): FlattenException
+    {
+        $cloner = new VarCloner();
+        $dumper = new class extends CliDumper {
+            protected function supportsColors(): bool
+            {
+                $outputStream = $this->outputStream;
+                $this->outputStream = fopen('php://stdout', 'w');
+
+                try {
+                    return parent::supportsColors();
+                } finally {
+                    $this->outputStream = $outputStream;
+                }
+            }
+        };
+
+        return FlattenException::createFromThrowable($exception)
+            ->setAsString($dumper->dump($cloner->cloneVar($exception), true));
+    }
+}