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.Scripts.Network.Data.TaskData.ItemPurchase/ItemPurchaseData.cs

@@ -0,0 +1,30 @@
+namespace Wizard.Scripts.Network.Data.TaskData.ItemPurchase;
+
+public class ItemPurchaseData
+{
+	public int purchase_id { get; set; }
+
+	public UserGoods.Type purchase_item_type { get; set; }
+
+	public long PurchaseUserGoodsId { get; set; }
+
+	public int purchase_item_num { get; set; }
+
+	public string purchase_name { get; set; }
+
+	public UserGoods.Type require_item_type { get; set; }
+
+	public long RequireUserGoodsId { get; set; }
+
+	public int require_item_num { get; set; }
+
+	public bool isMonthryReset { get; set; }
+
+	public string purchase_begin_time { get; set; }
+
+	public string purchase_end_time { get; set; }
+
+	public int rest { get; set; }
+
+	public string textureName { get; set; }
+}