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/PaymentBase.cs

@@ -0,0 +1,23 @@
+using UnityEngine;
+
+public class PaymentBase : MonoBehaviour
+{
+	public enum RefundWarningType
+	{
+		NONE,
+		WARNING,
+		PENALTY
+	}
+
+	protected bool IsAlertAgree;
+
+	protected void CallPaymentStartFromAlert(string ProductId)
+	{
+		IsAlertAgree = true;
+		purchaceStart(ProductId, isFromAlert: true);
+	}
+
+	public virtual void purchaceStart(string ProductId, bool isFromAlert = false)
+	{
+	}
+}