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/console/Event/ConsoleErrorEvent.php

@@ -0,0 +1,58 @@
+<?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\Console\Event;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Allows to handle throwables thrown while running a command.
+ *
+ * @author Wouter de Jong <wouter@wouterj.nl>
+ */
+final class ConsoleErrorEvent extends ConsoleEvent
+{
+    private int $exitCode;
+
+    public function __construct(
+        InputInterface $input,
+        OutputInterface $output,
+        private \Throwable $error,
+        ?Command $command = null,
+    ) {
+        parent::__construct($command, $input, $output);
+    }
+
+    public function getError(): \Throwable
+    {
+        return $this->error;
+    }
+
+    public function setError(\Throwable $error): void
+    {
+        $this->error = $error;
+    }
+
+    public function setExitCode(int $exitCode): void
+    {
+        $this->exitCode = $exitCode;
+
+        $r = new \ReflectionProperty($this->error, 'code');
+        $r->setValue($this->error, $this->exitCode);
+    }
+
+    public function getExitCode(): int
+    {
+        return $this->exitCode ?? (\is_int($this->error->getCode()) && 0 !== $this->error->getCode() ? $this->error->getCode() : 1);
+    }
+}