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/nesbot/carbon/lazy/Carbon/ProtectedDatePeriod.php

@@ -0,0 +1,73 @@
+<?php
+
+/**
+ * This file is part of the Carbon package.
+ *
+ * (c) Brian Nesbitt <brian@nesbot.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Carbon;
+
+use DatePeriod;
+
+if (!class_exists(DatePeriodBase::class, false)) {
+    class DatePeriodBase extends DatePeriod
+    {
+        /**
+         * Period start in PHP < 8.2.
+         *
+         * @var CarbonInterface
+         *
+         * @deprecated PHP 8.2 this property is no longer in sync with the actual period start.
+         */
+        protected $start;
+
+        /**
+         * Period end in PHP < 8.2.
+         *
+         * @var CarbonInterface|null
+         *
+         * @deprecated PHP 8.2 this property is no longer in sync with the actual period end.
+         */
+        protected $end;
+
+        /**
+         * Period current iterated date in PHP < 8.2.
+         *
+         * @var CarbonInterface|null
+         *
+         * @deprecated PHP 8.2 this property is no longer in sync with the actual period current iterated date.
+         */
+        protected $current;
+
+        /**
+         * Period interval in PHP < 8.2.
+         *
+         * @var CarbonInterval|null
+         *
+         * @deprecated PHP 8.2 this property is no longer in sync with the actual period interval.
+         */
+        protected $interval;
+
+        /**
+         * Period recurrences in PHP < 8.2.
+         *
+         * @var int|float|null
+         *
+         * @deprecated PHP 8.2 this property is no longer in sync with the actual period recurrences.
+         */
+        protected $recurrences;
+
+        /**
+         * Period start included option in PHP < 8.2.
+         *
+         * @var bool
+         *
+         * @deprecated PHP 8.2 this property is no longer in sync with the actual period start included option.
+         */
+        protected $include_start_date;
+    }
+}