Implemented roles and action timestamps. Added oermissions selector and interfaces

Moonlight.Api/Database/Entities/User.cs

@@ -1,16 +1,26 @@
 using System.ComponentModel.DataAnnotations;
+using Moonlight.Api.Database.Interfaces;
 
 namespace Moonlight.Api.Database.Entities;
 
-public class User
+public class User : IActionTimestamps
 {
     public int Id { get; set; }
 
+    // Base information
     [MaxLength(50)]
     public required string Username { get; set; }
     
     [MaxLength(254)]
     public required string Email { get; set; }
 
+    // Authentication
     public DateTimeOffset InvalidateTimestamp { get; set; }
+
+    // Relations
+    public List<RoleMember> RoleMemberships { get; set; } = [];
+    
+    // Action timestamps
+    public DateTimeOffset CreatedAt { get; set; }
+    public DateTimeOffset UpdatedAt { get; set; }
 }