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/NetworkLog.cs

@@ -0,0 +1,31 @@
+using System;
+
+public class NetworkLog
+{
+	public enum LogLevel
+	{
+		Info,
+		Warning,
+		Error
+	}
+
+	private const string FORMAT = "{0}:[{1}]{2}";
+
+	public LogLevel Level { get; }
+
+	public string Message { get; }
+
+	public DateTime Time { get; }
+
+	public NetworkLog(LogLevel level, string message)
+	{
+		Level = level;
+		Message = message;
+		Time = DateTime.UtcNow;
+	}
+
+	public override string ToString()
+	{
+		return $"{Time}:[{Level.ToString()}]{Message}";
+	}
+}