first commit

DTOs/Facility/FacilityRequests.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Fitness_core_BE.DTOs.Facility
+{
+    public class CreateFacilityRequest
+    {
+        [Required]
+        public string Name { get; set; } = string.Empty;
+
+        /// <summary>"Gym" | "Pool" | "Court" | "Class".</summary>
+        [Required]
+        public string FacilityType { get; set; } = "Class";
+
+        public string? Description { get; set; }
+
+        [Range(1, int.MaxValue, ErrorMessage = "DefaultCapacity must be at least 1")]
+        public int DefaultCapacity { get; set; } = 1;
+    }
+
+    public class UpdateFacilityRequest
+    {
+        [Required]
+        public Guid FacilityId { get; set; }
+        public string? Name { get; set; }
+        public string? FacilityType { get; set; }
+        public string? Description { get; set; }
+        public int? DefaultCapacity { get; set; }
+        public bool? IsActive { get; set; }
+    }
+
+    public class SetFacilityStatusRequest
+    {
+        [Required]
+        public bool IsActive { get; set; }
+    }
+
+    public class CreateFacilitySessionRequest
+    {
+        [Required]
+        public Guid FacilityId { get; set; }
+
+        [Required]
+        public DateTime StartTime { get; set; }
+
+        [Required]
+        public DateTime EndTime { get; set; }
+
+        /// <summary>Overrides the facility's default capacity for this specific session.</summary>
+        public int? Capacity { get; set; }
+    }
+}