feat: sync contingents for TYPO3 calendar hotels

src/Enum/ContingentHotelSource.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Enum;
+
+/**
+ * Where a hotel code in the contingent snapshot comes from. A code can have both.
+ */
+enum ContingentHotelSource: string
+{
+    /** The calendarCode of a group house (`Accommodation`). */
+    case Accommodation = 'accommodation';
+
+    /** The calendar hotel of a visible TYPO3 product, from TYPO3's `/api/calendar-hotels`. */
+    case Typo3 = 'typo3';
+}