feat: load availability data once per booking session

src/Service/TravelDataService.php

@@ -523,19 +523,18 @@ class TravelDataService
      * Gets availability data for a travel date.
      *
      * @param int  $dateId The travel date ID for API call
-     * @param bool $cached Whether to use cached data (default: false, TTL when cached: 300 seconds)
-     * @param int  $ttl    Cache TTL in seconds when $cached is true (default: 300 seconds)
+     * @param bool $cached Whether to use cached data (default: false, TTL when cached: 600 seconds)
+     * @param int  $ttl    Cache TTL in seconds when $cached is true (default: 600 seconds)
      *
      * @return ServiceAvailabilityResponse|null The availability data or null if not available or error occurred
      */
-    public function getAvailabilityData(int $dateId, bool $cached = false, int $ttl = 300): ?ServiceAvailabilityResponse
+    public function getAvailabilityData(int $dateId, bool $cached = false, int $ttl = 600): ?ServiceAvailabilityResponse
     {
         if ($cached) {
             $cacheKey = sprintf('availability_%d', $dateId);
 
             try {
                 return $this->cache->get($cacheKey, function (ItemInterface $item) use ($dateId, $ttl) {
-                    // Short TTL - availability is volatile and changes with bookings
                     $item->expiresAfter($ttl);
 
                     return $this->fetchAvailabilityData($dateId);