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/Log/DebugLoggerConfigurator.php

@@ -0,0 +1,55 @@
+<?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\Log;
+
+use Monolog\Logger;
+
+/**
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class DebugLoggerConfigurator
+{
+    private ?object $processor = null;
+
+    public function __construct(callable $processor, ?bool $enable = null)
+    {
+        if ($enable ?? !\in_array(\PHP_SAPI, ['cli', 'phpdbg', 'embed'], true)) {
+            $this->processor = \is_object($processor) ? $processor : $processor(...);
+        }
+    }
+
+    public function pushDebugLogger(Logger $logger): void
+    {
+        if ($this->processor) {
+            $logger->pushProcessor($this->processor);
+        }
+    }
+
+    public static function getDebugLogger(mixed $logger): ?DebugLoggerInterface
+    {
+        if ($logger instanceof DebugLoggerInterface) {
+            return $logger;
+        }
+
+        if (!$logger instanceof Logger) {
+            return null;
+        }
+
+        foreach ($logger->getProcessors() as $processor) {
+            if ($processor instanceof DebugLoggerInterface) {
+                return $processor;
+            }
+        }
+
+        return null;
+    }
+}