feat(battle-engine): full Unity/VFX/god-object shims + expanded copy closure (2570 files)

Authored Unity primitive/object-model shim, VFX layer (control-flow-preserving, InstantVfx never invokes its action -- headless suppression), god-object stubs (GameMgr/EffectMgr/UIManager with faithfully-extracted nested enums), View/UI/Touch tree, LitJson+BetterList+Tuple copied, third-party stubs. Discovered Roslyn header-error masking: fixing class-header type errors unmasks body references, so the true copy closure is ~2570 files (was 782 under masking). Errors: masked-25720 -> 268; our shim files compile clean. Remaining: ~50 residual shim/external types, 24 NGUI UI-base overrides, static-type fixes, plus likely 1-2 more unmask waves.

SVSim.BattleEngine/Engine/BattleUtility.cs

@@ -0,0 +1,67 @@
+using System.Collections.Generic;
+using System.Linq;
+
+public static class BattleUtility
+{
+	public class RepeatSkillsAndTiming
+	{
+		public List<SkillBase> _skills;
+
+		public List<string> _timings;
+
+		public RepeatSkillsAndTiming(List<SkillBase> skills, List<string> timings)
+		{
+			_timings = timings;
+			_skills = skills;
+		}
+	}
+
+	public static RepeatSkillsAndTiming GetRepeatSkillsWithTiming(List<SkillBase> skills)
+	{
+		if (skills == null || skills.Count == 0)
+		{
+			return null;
+		}
+		BattleCardBase ownerCard = skills.First().SkillPrm.ownerCard;
+		return GetRepeatSkillsWithTiming(ownerCard.SelfBattlePlayer, ownerCard, skills);
+	}
+
+	public static List<SkillBase> GetRepeatSkillsForPrediction(BattlePlayerBase sourcePlayer, BattleCardBase virtualCard)
+	{
+		if (virtualCard.Skills == null || virtualCard.Skills.Count() == 0)
+		{
+			return null;
+		}
+		return GetRepeatSkillsWithTiming(sourcePlayer, virtualCard, virtualCard.Skills.ToList())?._skills;
+	}
+
+	public static List<SkillBase> GetRepeatableWhenPlaySkill(BattleCardBase ownerCard, List<SkillBase> activeSkills, bool isInvokeCheck)
+	{
+		if (ownerCard.Skills.Any((SkillBase s) => s.IsUserSelectType && !(s is Skill_fusion)))
+		{
+			return null;
+		}
+		if (isInvokeCheck && !ownerCard.HasSkillWhenPlay(isOnlyNoSelect: true))
+		{
+			return null;
+		}
+		if (activeSkills.Count == 1 && activeSkills.Any((SkillBase s) => s is Skill_pp_fixeduse))
+		{
+			return null;
+		}
+		return activeSkills.Where((SkillBase c) => c.OnWhenPlayStart != 0).ToList();
+	}
+
+	private static RepeatSkillsAndTiming GetRepeatSkillsWithTiming(BattlePlayerBase player, BattleCardBase ownerCard, List<SkillBase> activeSkills)
+	{
+		List<SkillBase> list = new List<SkillBase>();
+		List<string> list2 = new List<string>();
+		IEnumerable<SkillBase> enumerable = activeSkills.Where((SkillBase s) => s.IsWhenDestroySkill);
+		if (player.Class.SkillApplyInformation.RepeatSkillTimingList.Any((RepeatSkillInfo s) => s.Timing == "when_destroy" && Skill_repeat_skill.CheckCardType(s.Target, ownerCard)) && enumerable.Count() > 0)
+		{
+			list.AddRange(enumerable);
+			list2.Add("when_destroy");
+		}
+		return new RepeatSkillsAndTiming(list, list2);
+	}
+}