first commit

Models/GymRolePermission.cs

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+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Fitness_core_BE.Models
+{
+    // Join row: a GymRole is granted access to one NavItem/permission key.
+    // Composite key (FKGymRoleId, NavItemKey) is configured in TenantDbContext.OnModelCreating.
+    public class GymRolePermission
+    {
+        public Guid FKGymRoleId { get; set; }
+        [ForeignKey("FKGymRoleId")]
+        public virtual GymRole GymRole { get; set; }
+
+        // NavItem is central-bucket (global nav catalog); this FK is a plain scalar in
+        // TenantDbContext (see Ignore config there) -- resolve the label from NavItemKey
+        // against CentralDbContext.NavItems when actually needed.
+        public string NavItemKey { get; set; } = string.Empty;
+        [ForeignKey("NavItemKey")]
+        public virtual NavItem NavItem { get; set; }
+    }
+}