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.Dialog.Setting/ItemGrid.cs

@@ -0,0 +1,52 @@
+using UnityEngine;
+
+namespace Wizard.Dialog.Setting;
+
+public class ItemGrid : Item
+{
+	[SerializeField]
+	private UIGrid _grid;
+
+	public UIGrid GetUIGrid()
+	{
+		return _grid;
+	}
+
+	public void SetArangement(UIGrid.Arrangement arrangement)
+	{
+		_grid.arrangement = arrangement;
+	}
+
+	public UIGrid.Arrangement GetArrangement()
+	{
+		return _grid.arrangement;
+	}
+
+	public void SetCellWidth(float width)
+	{
+		_grid.cellWidth = width;
+	}
+
+	public float GetCellWidth()
+	{
+		return _grid.cellWidth;
+	}
+
+	public void SetCellHeight(float height)
+	{
+		_grid.cellHeight = height;
+	}
+
+	public float GetCellHeight()
+	{
+		return _grid.cellHeight;
+	}
+
+	public override void AddChangeCallback(EventDelegate.Callback callback)
+	{
+	}
+
+	public override void SetActive_SeparatorLine(bool isActive)
+	{
+	}
+}