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/sebastian/diff/src/Exception/ConfigurationException.php

@@ -0,0 +1,32 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff;
+
+use function gettype;
+use function is_object;
+use function sprintf;
+use Exception;
+
+final class ConfigurationException extends InvalidArgumentException
+{
+    public function __construct(string $option, string $expected, mixed $value, int $code = 0, ?Exception $previous = null)
+    {
+        parent::__construct(
+            sprintf(
+                'Option "%s" must be %s, got "%s".',
+                $option,
+                $expected,
+                is_object($value) ? $value::class : (null === $value ? '<null>' : gettype($value) . '#' . $value),
+            ),
+            $code,
+            $previous,
+        );
+    }
+}

vendor/sebastian/diff/src/Exception/Exception.php

@@ -0,0 +1,16 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff;
+
+use Throwable;
+
+interface Exception extends Throwable
+{
+}

vendor/sebastian/diff/src/Exception/InvalidArgumentException.php

@@ -0,0 +1,14 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/diff.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\Diff;
+
+class InvalidArgumentException extends \InvalidArgumentException implements Exception
+{
+}