Reorganized file structure and namespaces

dotnet/AipsCore/Infrastructure/Persistence/RefreshToken/RefreshToken.cs

@@ -0,0 +1,19 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace AipsCore.Infrastructure.Persistence.RefreshToken;
+
+public class RefreshToken
+{
+    [Key]
+    public Guid Id { get; set; }
+    
+    [Required]
+    [MaxLength(255)]
+    public required string Token { get; set; }
+    
+    
+    public Guid UserId { get; set; }
+    public User.User User { get; set; } = null!;
+    
+    public DateTime ExpiresAt { get; set; }
+}