first commit

Models/DevicePricingConfig.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Fitness_core_BE.Models
+{
+    // Single global row (admin-editable) for access-control-device fees.
+    // Not per-plan: every gym pays the same device rates in the source pricing model.
+    public class DevicePricingConfig
+    {
+        [Key]
+        public Guid DevicePricingConfigId { get; set; }
+
+        public decimal DeviceRentalFeePerMonth { get; set; } = 0;
+        public decimal DeviceInstallationFee { get; set; } = 0;
+        public decimal DeviceConfigureExistingFee { get; set; } = 0;
+
+        public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+    }
+}