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; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Gift/GiftTopResponse.cs

@@ -0,0 +1,70 @@
+using System.Text.Json.Serialization;
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Gift;
+
+[MessagePackObject]
+public class GiftTopResponse
+{
+    [JsonPropertyName("present_list")]
+    [Key("present_list")]
+    public List<PresentDto> PresentList { get; set; } = new();
+
+    [JsonPropertyName("present_history_list")]
+    [Key("present_history_list")]
+    public List<PresentDto> PresentHistoryList { get; set; } = new();
+
+    [JsonPropertyName("limit_over_present_list")]
+    [Key("limit_over_present_list")]
+    public List<PresentDto> LimitOverPresentList { get; set; } = new();
+}
+
+/// <summary>
+/// Prod sends most numeric-looking fields as STRINGS on this endpoint
+/// (present_id, reward_type, reward_detail_id, reward_count, condition_number,
+/// present_limit_type). item_type is an INT. We mirror the prod shape exactly.
+/// </summary>
+[MessagePackObject]
+public class PresentDto
+{
+    [JsonPropertyName("present_id")]
+    [Key("present_id")]
+    public string PresentId { get; set; } = string.Empty;
+
+    [JsonPropertyName("reward_type")]
+    [Key("reward_type")]
+    public string RewardType { get; set; } = string.Empty;
+
+    [JsonPropertyName("reward_detail_id")]
+    [Key("reward_detail_id")]
+    public string RewardDetailId { get; set; } = string.Empty;
+
+    [JsonPropertyName("reward_count")]
+    [Key("reward_count")]
+    public string RewardCount { get; set; } = string.Empty;
+
+    [JsonPropertyName("condition_number")]
+    [Key("condition_number")]
+    public string ConditionNumber { get; set; } = "0";
+
+    [JsonPropertyName("present_limit_type")]
+    [Key("present_limit_type")]
+    public string PresentLimitType { get; set; } = "0";
+
+    [JsonPropertyName("reward_limit_time")]
+    [Key("reward_limit_time")]
+    public int RewardLimitTime { get; set; }
+
+    [JsonPropertyName("create_time")]
+    [Key("create_time")]
+    public string CreateTime { get; set; } = string.Empty;
+
+    /// <summary>Only present on item/pack-ticket entries (gifts where reward_type=4); omit on currency entries.</summary>
+    [JsonPropertyName("item_type")]
+    [Key("item_type")]
+    public int? ItemType { get; set; }
+
+    [JsonPropertyName("message")]
+    [Key("message")]
+    public string Message { get; set; } = string.Empty;
+}