refactor(db): remove ViewerClaimedTutorialGift — replaced by ViewerPresent.Status

SVSim.Database/Models/ViewerClaimedTutorialGift.cs

@@ -1,14 +0,0 @@
-namespace SVSim.Database.Models;
-
-/// <summary>
-/// Records that a viewer has claimed a specific tutorial gift present_id. Composite key
-/// (ViewerId, PresentId) — viewer can't claim the same present twice.
-/// </summary>
-public class ViewerClaimedTutorialGift
-{
-    public long ViewerId { get; set; }
-    public string PresentId { get; set; } = string.Empty;
-    public DateTime ClaimedAt { get; set; }
-
-    public Viewer Viewer { get; set; } = null!;
-}