Prebuilt deck purchasing and fixes

SVSim.EmulatedEntrypoint/Models/Dtos/Requests/BuildDeck/BuildDeckBuyRequest.cs

@@ -0,0 +1,21 @@
+using System.Text.Json.Serialization;
+using MessagePack;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.BuildDeck;
+
+/// <summary>
+/// /build_deck/buy request body. sales_type is ShopCommonUtility.SalesType:
+/// 0=free, 1=crystal, 2=rupy, 3=ticket (v1: 3 returns 501).
+/// </summary>
+[MessagePackObject]
+public class BuildDeckBuyRequest : BaseRequest
+{
+    [JsonPropertyName("product_id")]
+    [Key("product_id")]
+    public int ProductId { get; set; }
+
+    [JsonPropertyName("sales_type")]
+    [Key("sales_type")]
+    public int SalesType { get; set; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Requests/BuildDeck/BuildDeckGetPurchaseCountRequest.cs

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

SVSim.EmulatedEntrypoint/Models/Dtos/Requests/BuildDeck/BuildDeckInfoRequest.cs

@@ -0,0 +1,17 @@
+using System.Text.Json.Serialization;
+using MessagePack;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.BuildDeck;
+
+/// <summary>
+/// /build_deck/info request body. <c>add_series_id == 0</c> means "return all"; non-zero filters
+/// to the single matching series (used by the client to re-fetch after a purchase).
+/// </summary>
+[MessagePackObject]
+public class BuildDeckInfoRequest : BaseRequest
+{
+    [JsonPropertyName("add_series_id")]
+    [Key("add_series_id")]
+    public int AddSeriesId { get; set; }
+}