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/Wizard/PracticeDataMgr.cs

@@ -0,0 +1,36 @@
+using System.Collections.Generic;
+using System.Linq;
+using LitJson;
+
+namespace Wizard;
+
+public class PracticeDataMgr
+{
+	private List<PracticeData> _dataList = new List<PracticeData>();
+
+	public List<int> CampaignClassIdList { get; private set; } = new List<int>();
+
+	public PracticeDataMgr(JsonData data)
+	{
+		if (data == null)
+		{
+			return;
+		}
+		for (int i = 0; i < data.Count; i++)
+		{
+			_dataList.Add(new PracticeData(data[i]));
+		}
+		foreach (PracticeData data2 in _dataList)
+		{
+			if (data2.IsCampaign && !CampaignClassIdList.Contains(data2.ClassId))
+			{
+				CampaignClassIdList.Add(data2.ClassId);
+			}
+		}
+	}
+
+	public List<PracticeData> GetClassDataList(int classId)
+	{
+		return _dataList.Where((PracticeData data) => data.ClassId == classId).ToList();
+	}
+}