feat: add guest notification center

app/Enums/GuestNotificationAudience.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Enums;
+
+enum GuestNotificationAudience: string
+{
+    case ALL = 'all';
+    case GUEST = 'guest';
+
+    public function label(): string
+    {
+        return match ($this) {
+            self::ALL => __('Alle Gäste'),
+            self::GUEST => __('Individuelle Gäste'),
+        };
+    }
+}