feat(battle-engine): preserve ctor base-initializers + Event/Reward shims (1386->1226)

- Regenerate 31 VFX/View/UI/Touch stubs to keep their decomp ': base(...)' /
  ': this(...)' ctor initializers (m1_stub_gen was dropping them -> CS7036/CS1729
  when the copied base has no parameterless ctor). Whole base-ctor cluster cleared.
- UnityEngine.Event: add rawType/keyCode/modifiers/Use() + EventType enum (NGUI
  UIInput/UIInputOnGUI legacy IMGUI path).
- Reward: copy the real Wizard.Scripts.Network.Data.TaskData.Arena.Reward verbatim
  (was an empty ambiguous-name shim in LooseEnds); deps (UserGoods/JsonData) present.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

SVSim.BattleEngine/Shim/External/LooseEnds.cs

@@ -17,7 +17,6 @@ namespace Wizard.Scripts.Network.Data.TaskData.SpotCardExchange { internal class
 namespace Wizard.DeckSelect.FirstDisplayPageIndexGetter { internal class _ShimAnchor { } }
 namespace Wizary.StorySelectionWorld { internal class _ShimAnchor { } }
 namespace Wizard.Scripts.Network.Data.TableData.Arena.TwoPick { internal class _ShimAnchor { } }
-namespace Wizard.Scripts.Network.Data.TaskData.Arena { public class Reward { } }
 
 // IManager: a Cute manager interface implemented by NetworkManager/ResourcesManager.
 namespace Cute { public interface IManager { } }