success: Boolean indicating whether the availability data was successfully retrieved.
data: An array of availability objects, each representing a room type’s availability across multiple dates.
reslyRoomTypeId: The internal Resly identifier for the room type (e.g., "1BR-GARDEN").
channelRoomTypeCode: The external room type code used by the connected OTA or channel.
availableObj: A key-value object mapping dates (YYYY-MM-DD) to the number of units available for that room type on that specific day.
Example: "2025-06-01": 3 means 3 units of that room type are available on June 1st, 2025.