Pack logic cleanup

SVSim.EmulatedEntrypoint/Services/DbCardPoolProvider.cs

@@ -16,27 +16,26 @@ public class DbCardPoolProvider : ICardPoolProvider
         {
             case PackCategory.None:
             case PackCategory.LegendCardPack:
-                // Standard pack — pool comes from the card set whose id equals base_pack_id.
                 return _db.CardSets
-                    .Include(s => s.Cards)
                     .Where(s => s.Id == pack.BasePackId)
                     .SelectMany(s => s.Cards)
+                    .Where(c => !c.IsFoil)
                     .ToList();
 
             case PackCategory.SpecialCardPack:
             case PackCategory.LimitedSpecialCardPack:
-                // Legendary-special packs pull from all rotation sets. The slot-8 forced-Legendary
-                // rule in PackOpenService delivers the "at least one legendary" promise.
                 return _db.CardSets
                     .Where(s => s.IsInRotation)
-                    .Include(s => s.Cards)
                     .SelectMany(s => s.Cards)
+                    .Where(c => !c.IsFoil)
                     .Distinct()
                     .ToList();
 
             default:
-                // Skin / starter / leader-skin packs aren't drawn in v1 — controller rejects earlier.
                 return Array.Empty<ShadowverseCardEntry>();
         }
     }
+
+    public ShadowverseCardEntry? TryGetFoilTwin(long baseCardId) =>
+        _db.Cards.FirstOrDefault(c => c.Id == baseCardId + 1 && c.IsFoil);
 }