feat: add raw contingent availability endpoint

src/Service/ContingentSnapshotReader.php

@@ -41,14 +41,14 @@ class ContingentSnapshotReader
      * Per-day statuses keyed by Y-m-d, or null when there is no usable snapshot for this hotel.
      *
      * Days inside the range that the snapshot does not cover are simply absent from the map;
-     * what that means is the caller's decision.
+     * what that means is the caller's decision. A null dateTo reads to the end of the snapshot.
      *
      * @return array<string, ContingentStatus>|null
      */
     public function statusesFor(
         Accommodation $accommodation,
         \DateTimeImmutable $dateFrom,
-        \DateTimeImmutable $dateTo,
+        ?\DateTimeImmutable $dateTo,
     ): ?array {
         $hotelCode = $accommodation->getCalendarCode();