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/src/Carbon/Constants/DiffOptions.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * 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\Constants;
+
+interface DiffOptions
+{
+    /**
+     * Diff wording options(expressed in octal).
+     */
+    public const NO_ZERO_DIFF = 01;
+    public const JUST_NOW = 02;
+    public const ONE_DAY_WORDS = 04;
+    public const TWO_DAY_WORDS = 010;
+    public const SEQUENTIAL_PARTS_ONLY = 020;
+    public const ROUND = 040;
+    public const FLOOR = 0100;
+    public const CEIL = 0200;
+
+    /**
+     * Diff syntax options.
+     */
+    public const DIFF_ABSOLUTE = 1; // backward compatibility with true
+    public const DIFF_RELATIVE_AUTO = 0; // backward compatibility with false
+    public const DIFF_RELATIVE_TO_NOW = 2;
+    public const DIFF_RELATIVE_TO_OTHER = 3;
+}