refactor(core): enhance User and RefreshToken domain models

src/FiscalOS.Core/Identity/RefreshToken.cs

@@ -5,7 +5,8 @@ public sealed class RefreshToken : Entity
   public string Token { get; init; } = string.Empty;
   public DateTimeOffset ExpiresAt { get; init; }
   public Guid UserId { get; init; }
-  public User User { get; init; } = null!;
+  public User? User { get; init; }
+  public bool Revoked { get; set; }
 
   private RefreshToken()
   {
@@ -20,4 +21,27 @@ public sealed class RefreshToken : Entity
       ExpiresAt = expiresAt,
     };
   }
+
+  public static RefreshToken From(User user, string token, DateTimeOffset expiresAt)
+  {
+    ArgumentNullException.ThrowIfNull(user);
+
+    return new()
+    {
+      User = user,
+      UserId = user.Id,
+      Token = token,
+      ExpiresAt = expiresAt,
+    };
+  }
+
+  public void Revoke()
+  {
+    Revoked = true;
+  }
+
+  public bool IsExpired(DateTimeOffset now)
+  {
+    return now >= ExpiresAt;
+  }
 }