feat(pack): gacha-point endpoint DTOs

SVSim.EmulatedEntrypoint/Models/Dtos/GachaPointRewardDetailEntry.cs

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+using System.Text.Json.Serialization;
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos;
+
+/// <summary>
+/// One entry inside <c>gacha_point_rewards[i].reward_list</c>. Different shape from the
+/// post-state-totals <see cref="RewardListEntry"/> used by /pack/open: this is a catalog
+/// declaration ("here's what you'd get if you exchanged"), not a viewer-state assignment.
+/// Wire keys verified against prod capture data_dumps/traffic_prod_tradeables_capture.ndjson.
+/// </summary>
+[MessagePackObject]
+public class GachaPointRewardDetailEntry
+{
+    [JsonPropertyName("reward_type")]
+    [Key("reward_type")]
+    public int RewardType { get; set; }
+
+    [JsonPropertyName("reward_detail_id")]
+    [Key("reward_detail_id")]
+    public long RewardDetailId { get; set; }
+
+    [JsonPropertyName("reward_number")]
+    [Key("reward_number")]
+    public int RewardNumber { get; set; } = 1;
+}

SVSim.EmulatedEntrypoint/Models/Dtos/GachaPointRewardDto.cs

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+using System.Text.Json.Serialization;
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos;
+
+/// <summary>
+/// One row of <c>gacha_point_rewards[]</c>. The client groups by <see cref="ClassId"/>
+/// (CardBasePrm.ClanType, stringified on the wire) inside GachaPointExchangeInfoTask.Parse.
+/// </summary>
+[MessagePackObject]
+public class GachaPointRewardDto
+{
+    /// <summary>Stringified on the wire (e.g. "0", "1"). CardBasePrm.ClanType value.</summary>
+    [JsonPropertyName("class_id")]
+    [Key("class_id")]
+    public string ClassId { get; set; } = "0";
+
+    [JsonPropertyName("card_id")]
+    [Key("card_id")]
+    public long CardId { get; set; }
+
+    [JsonPropertyName("reward_list")]
+    [Key("reward_list")]
+    public List<GachaPointRewardDetailEntry> RewardList { get; set; } = new();
+
+    [JsonPropertyName("is_received")]
+    [Key("is_received")]
+    public bool IsReceived { get; set; }
+
+    [JsonPropertyName("is_display_prize")]
+    [Key("is_display_prize")]
+    public bool IsDisplayPrize { get; set; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Pack/ExchangeGachaPointRequest.cs

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+using System.Text.Json.Serialization;
+using MessagePack;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Pack;
+
+[MessagePackObject]
+public class ExchangeGachaPointRequest : BaseRequest
+{
+    [JsonPropertyName("card_id")]
+    [Key("card_id")]
+    public long CardId { get; set; }
+
+    [JsonPropertyName("parent_gacha_id")]
+    [Key("parent_gacha_id")]
+    public int ParentGachaId { get; set; }
+
+    [JsonPropertyName("odds_gacha_id")]
+    [Key("odds_gacha_id")]
+    public int OddsGachaId { get; set; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Pack/GetGachaPointRewardsRequest.cs

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+using System.Text.Json.Serialization;
+using MessagePack;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Pack;
+
+/// <summary>
+/// Inbound /pack/get_gacha_point_rewards body. Capture shows odds_gacha_id and parent_gacha_id
+/// are always the same value (the pack id); we only consume parent_gacha_id for the lookup.
+/// </summary>
+[MessagePackObject]
+public class GetGachaPointRewardsRequest : BaseRequest
+{
+    [JsonPropertyName("odds_gacha_id")]
+    [Key("odds_gacha_id")]
+    public int OddsGachaId { get; set; }
+
+    [JsonPropertyName("parent_gacha_id")]
+    [Key("parent_gacha_id")]
+    public int ParentGachaId { get; set; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Pack/ExchangeGachaPointResponse.cs

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+using System.Text.Json.Serialization;
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Pack;
+
+[MessagePackObject]
+public class ExchangeGachaPointResponse
+{
+    /// <summary>
+    /// POST-STATE TOTALS dispatched through PlayerStaticData.UpdateHaveUserGoodsNumByJsonData
+    /// on the client (see project_wire_reward_list_post_state memory). The granted card,
+    /// any cascading cosmetics, and the updated gacha-point balance entry all appear here.
+    /// </summary>
+    [JsonPropertyName("reward_list")]
+    [Key("reward_list")]
+    public List<RewardListEntry> RewardList { get; set; } = new();
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Pack/GetGachaPointRewardsResponse.cs

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+using System.Text.Json.Serialization;
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Pack;
+
+[MessagePackObject]
+public class GetGachaPointRewardsResponse
+{
+    [JsonPropertyName("gacha_point_rewards")]
+    [Key("gacha_point_rewards")]
+    public List<GachaPointRewardDto> GachaPointRewards { get; set; } = new();
+}