first commit

DTOs/TimeBankCard/TimeBankCardDto.cs

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+namespace Fitness_core_BE.DTOs.TimeBankCard
+{
+    public class TimeBankCardDto
+    {
+        public Guid TimeBankCardId { get; set; }
+        public string RfidTagId { get; set; } = string.Empty;
+        public Guid? CustomerId { get; set; }
+        public int TotalMinutesPurchased { get; set; }
+        public int MinutesRemaining { get; set; }
+        public decimal AmountPaid { get; set; }
+        public DateTime PurchasedAt { get; set; }
+        public DateTime? ExpiresAt { get; set; }
+        public bool IsActive { get; set; }
+
+        /// <summary>True right after a tap-in swipe (session open, clock running); false after
+        /// tap-out or when the card has no open session.</summary>
+        public bool SessionOpen { get; set; }
+        public DateTime? SessionStartedAt { get; set; }
+        public string? SessionFacilityName { get; set; }
+
+        /// <summary>Only populated in the response to a tap-out swipe.</summary>
+        public int? MinutesDeductedThisSwipe { get; set; }
+    }
+}