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/CrossoverRewardInfo.cs

@@ -0,0 +1,35 @@
+using LitJson;
+
+namespace Wizard;
+
+public class CrossoverRewardInfo
+{
+	public enum RewardStatus
+	{
+		NotAchieved,
+		NotReceived,
+		Received
+	}
+
+	public int RewardId;
+
+	public int Rank;
+
+	public int RewardType;
+
+	public int RewardDetailId;
+
+	public int RewardCount;
+
+	public RewardStatus Status;
+
+	public CrossoverRewardInfo(JsonData data)
+	{
+		RewardId = data["reward_id"].ToInt();
+		Rank = data["rank"].ToInt();
+		RewardType = data["reward_type"].ToInt();
+		RewardDetailId = data["reward_detail_id"].ToInt();
+		RewardCount = data["reward_count"].ToInt();
+		Status = (RewardStatus)data["status"].ToInt();
+	}
+}