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/Exception/SilencedErrorContext.php

@@ -0,0 +1,63 @@
+<?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\Exception;
+
+/**
+ * Data Object that represents a Silenced Error.
+ *
+ * @author Grégoire Pineau <lyrixx@lyrixx.info>
+ */
+class SilencedErrorContext implements \JsonSerializable
+{
+    public int $count = 1;
+
+    public function __construct(
+        private int $severity,
+        private string $file,
+        private int $line,
+        private array $trace = [],
+        int $count = 1,
+    ) {
+        $this->count = $count;
+    }
+
+    public function getSeverity(): int
+    {
+        return $this->severity;
+    }
+
+    public function getFile(): string
+    {
+        return $this->file;
+    }
+
+    public function getLine(): int
+    {
+        return $this->line;
+    }
+
+    public function getTrace(): array
+    {
+        return $this->trace;
+    }
+
+    public function jsonSerialize(): array
+    {
+        return [
+            'severity' => $this->severity,
+            'file' => $this->file,
+            'line' => $this->line,
+            'trace' => $this->trace,
+            'count' => $this->count,
+        ];
+    }
+}