feat(pack): gacha-point endpoint DTOs

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; }
+}