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/Convention/Offline.cs

@@ -0,0 +1,13 @@
+namespace Convention;
+
+public class Offline
+{
+	public const int CARD_NUMBER_OF_POSSESSION = 3;
+
+	public static bool IsConventionMode { get; set; }
+
+	public static void OnSoftwareReset()
+	{
+		IsConventionMode = false;
+	}
+}