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/AddHealModifierInfo.cs

@@ -0,0 +1,20 @@
+public class AddHealModifierInfo : HealModifier
+{
+	public int AddHealAmount { get; private set; }
+
+	public AddHealModifierInfo(int addHealAmount, int order, BattleCardBase owner)
+	{
+		AddHealAmount = addHealAmount;
+		base.OrderCount = order;
+		_owner = owner;
+	}
+
+	public override int Calc(int healAmount, BattleCardBase healOwner, BattleCardBase target)
+	{
+		if (healOwner.IsPlayer != _owner.IsPlayer)
+		{
+			return healAmount;
+		}
+		return healAmount + AddHealAmount;
+	}
+}