first commit

Models/GymRole.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Fitness_core_BE.Models
+{
+    // A gym owner's custom, per-tenant staff role. Blank slate — creating a role grants
+    // zero permissions; the owner assigns them explicitly via GymRolePermission afterward.
+    public class GymRole
+    {
+        [Key]
+        public Guid GymRoleId { get; set; }
+
+        public Guid FKClientId { get; set; }
+        [ForeignKey("FKClientId")]
+        public virtual Client Client { get; set; }
+
+        public string Name { get; set; } = string.Empty;
+        public bool IsActive { get; set; } = true;
+        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+        public virtual ICollection<GymRolePermission> Permissions { get; set; } = new List<GymRolePermission>();
+    }
+}