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/TimeLeftUpdate.cs

@@ -0,0 +1,28 @@
+using System;
+using UnityEngine;
+using Wizard;
+
+public class TimeLeftUpdate : MonoBehaviour
+{
+	[NonSerialized]
+	public MailData mailData;
+
+	[SerializeField]
+	public UILabel timeLeft;
+
+	public void UpdateTime()
+	{
+		if (mailData != null)
+		{
+			SystemText systemText = Data.SystemText;
+			if (mailData.limit_type == 1)
+			{
+				timeLeft.text = Mail.GetTimeLeft(mailData.reward_limit_time);
+			}
+			else
+			{
+				timeLeft.text = systemText.Get("Mail_0030");
+			}
+		}
+	}
+}