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/Wizard/GatheringCreateTask.cs

@@ -0,0 +1,72 @@
+using System.Collections.Generic;
+
+namespace Wizard;
+
+public class GatheringCreateTask : BaseTask
+{
+	public class DeckEntry
+	{
+		public int deck_no;
+
+		public string deck_name;
+
+		public DeckEntry(DeckData deck)
+		{
+			deck_no = deck.GetDeckID();
+			deck_name = deck.GetDeckName();
+		}
+	}
+
+	public class GatheringCreateTaskParam : BaseParam
+	{
+		public int join_member_limit;
+
+		public int is_master_joined;
+
+		public int deck_format;
+
+		public int battle_type;
+
+		public int watch_type;
+
+		public long battle_begin_timestamp;
+
+		public int battle_hours;
+
+		public int gathering_type;
+
+		public int is_deck_entry;
+
+		public int tournament_format;
+
+		public Dictionary<string, DeckEntry> deck_list = new Dictionary<string, DeckEntry>();
+	}
+
+	public GatheringCreateTask()
+	{
+		base.type = ApiType.Type.GatheringCreate;
+	}
+
+	public void SetParameter(GatheringRule rule, List<DeckData> deckList)
+	{
+		GatheringCreateTaskParam gatheringCreateTaskParam = new GatheringCreateTaskParam();
+		gatheringCreateTaskParam.deck_format = Data.FormatConvertApi(rule.BattleParameterInstance.DeckFormat);
+		gatheringCreateTaskParam.join_member_limit = rule.MaxMember;
+		gatheringCreateTaskParam.is_master_joined = (rule.IsOwnerEntryBattle ? 1 : 0);
+		gatheringCreateTaskParam.battle_type = (int)rule.BattleParameterInstance.Rule;
+		gatheringCreateTaskParam.watch_type = (int)rule.WatchSetting;
+		gatheringCreateTaskParam.battle_begin_timestamp = (long)ConvertTime.DateTimeToUnixTime(rule.BattleStartUtcTime);
+		gatheringCreateTaskParam.battle_hours = rule.BattleTimeHour;
+		gatheringCreateTaskParam.is_deck_entry = (rule.IsEntryDeckOnly ? 1 : 0);
+		gatheringCreateTaskParam.gathering_type = (int)rule.Type;
+		gatheringCreateTaskParam.tournament_format = (int)rule.TournamentType;
+		if (deckList != null)
+		{
+			for (int i = 0; i < deckList.Count; i++)
+			{
+				gatheringCreateTaskParam.deck_list[i.ToString()] = new DeckEntry(deckList[i]);
+			}
+		}
+		base.Params = gatheringCreateTaskParam;
+	}
+}