Prebuilt deck purchasing and fixes

SVSim.EmulatedEntrypoint/Program.cs

@@ -2,6 +2,7 @@ using System.Text.Json;
 using System.Text.Json.Serialization;
 using Microsoft.EntityFrameworkCore;
 using SVSim.Database;
+using SVSim.Database.Repositories.BuildDeck;
 using SVSim.Database.Repositories.Card;
 using SVSim.Database.Repositories.Collectibles;
 using SVSim.Database.Repositories.Deck;
@@ -73,6 +74,7 @@ public class Program
         builder.Services.AddTransient<IPuzzleCatalogRepository, PuzzleCatalogRepository>();
         builder.Services.AddTransient<IDeckRepository, DeckRepository>();
         builder.Services.AddTransient<IPackRepository, PackRepository>();
+        builder.Services.AddTransient<IBuildDeckRepository, BuildDeckRepository>();
         // Scoped (not Singleton) to avoid the singleton-depends-on-scoped-DbContext lifecycle
         // pitfall. Cost: one indexed single-row query per section per request — trivial. No
         // in-process cache today; the IGameConfigService interface is shaped to allow one later.