feat(battle-engine): close the AI-simulation subsystem (verbatim)

Copied the 89 uncopied AI*SimulationUtility/extension files defining the
AIVirtualCard/AIVirtualField extension methods; the compile loop then auto-closed
the revealed type deps (~3049 files total, drift-clean). 10.0k -> 62 errors.

SVSim.BattleEngine/Engine/PaymentSkuInfo.cs

@@ -0,0 +1,38 @@
+using System.Collections.Generic;
+
+public class PaymentSkuInfo
+{
+	public string title;
+
+	public string price;
+
+	public string description;
+
+	public string productId;
+
+	public string currencyCode;
+
+	public string currencySymbol;
+
+	public string formattedPrice;
+
+	public double priceAmountMicros;
+
+	public string countryCode;
+
+	public string downloadContentVersion;
+
+	public bool downloadable;
+
+	public List<long> downloadContentLengths = new List<long>();
+
+	public string type;
+
+	public PaymentSkuInfo(string strShopName, string strPrice, string strShopDescription, string strProductID)
+	{
+		title = strShopName;
+		price = strPrice;
+		description = strShopDescription;
+		productId = strProductID;
+	}
+}