Add PricePerHour to booking requests and update validation logic

DTOs/Booking/BookingRequests.cs

@@ -52,6 +52,11 @@ namespace Fitness_core_BE.DTOs.Booking
         public string GuestPhone { get; set; } = string.Empty;
 
         public int? PartySize { get; set; }
+
+        /// <summary>Overrides the facility's own PricePerHour for this booking's charge only --
+        /// the FE pre-fills this from the facility but lets staff adjust it.</summary>
+        [Range(typeof(decimal), "0", "79228162514264337593543950335", ErrorMessage = "PricePerHour cannot be negative")]
+        public decimal? PricePerHour { get; set; }
     }
 
     public class MarkGuestBookingPaidRequest