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/CardPanelMaintenancePlate.cs

@@ -0,0 +1,21 @@
+using UnityEngine;
+
+public class CardPanelMaintenancePlate : MonoBehaviour
+{
+	[SerializeField]
+	private UISprite _sprite;
+
+	[SerializeField]
+	private UILabel _label;
+
+	public void SetDepth(int depth)
+	{
+		_sprite.depth = depth;
+		_label.depth = depth + 1;
+	}
+
+	public void SetText(string text)
+	{
+		_label.text = text;
+	}
+}