feat(tutorial): add /tutorial/gift_top with hardcoded starter present list

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Gift/GiftTopRequest.cs

@@ -0,0 +1,13 @@
+using System.Text.Json.Serialization;
+using MessagePack;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Gift;
+
+[MessagePackObject]
+public class GiftTopRequest : BaseRequest
+{
+    [JsonPropertyName("page")]
+    [Key("page")]
+    public int Page { get; set; }
+}