feat(packs): split TryGetFoilTwin into ICardFoilLookup

Extracts the foil-twin lookup from ICardPoolProvider into a dedicated
ICardFoilLookup service. PackOpenService takes the lookup as a
parameter; the legacy DbCardPoolProvider stays registered until T12
removes it.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.EmulatedEntrypoint/Program.cs

@@ -81,6 +81,7 @@ public class Program
         // in-process cache today; the IGameConfigService interface is shaped to allow one later.
         builder.Services.AddScoped<SVSim.Database.Services.IGameConfigService, GameConfigService>();
         builder.Services.AddScoped<ICardPoolProvider, DbCardPoolProvider>();
+        builder.Services.AddScoped<ICardFoilLookup, DbCardFoilLookup>();
         builder.Services.AddScoped<PackOpenService>();
         builder.Services.AddScoped<IGachaPointService, GachaPointService>();
         builder.Services.AddScoped<ICardAcquisitionService, CardAcquisitionService>();