v11 全量评审：修复 TD-13 至 TD-17

- TD-13: IQuestManager.CompleteQuest 改用 IRewardTarget，移除 using BaseGames.Player
- TD-14: HurtFlashController 缓存 WaitForSeconds（_waitForFlash 字段）
- TD-16: LiquidType 枚举迁移至 BaseGames.Core.Events；LiquidEvent.LiquidType 改为枚举直接比较
- TD-17: DeathScreenController 移除失效的 _onPlayerDied 订阅，改为 OnEnable 直接启动延迟显示

影响文件: IQuestManager.cs / HurtFlashController.cs / LiquidType.cs(迁移) /
  LiquidEvent.cs / LiquidZone.cs / WaterDangerState.cs /
  UnderwaterPostProcessingController.cs / UnderwaterAudioController.cs /
  DeathScreenController.cs

评审文档: Docs/Review/FrameworkReview_2026_May_v11.md（综合评分 9.30/10）

Assets/Scripts/UI/Menus/DeathScreenController.cs

@@ -12,15 +12,20 @@ namespace BaseGames.UI.Menus
         [SerializeField] private Button   _btnRespawn;
 
         [Header("Event Channels")]
-        [SerializeField] private VoidEventChannelSO _onPlayerDied;
         [SerializeField] private VoidEventChannelSO _onDeathScreenConfirmed;
 
-        private readonly CompositeDisposable _subs = new();
+        private void OnEnable()
+        {
+            // 死亡界面由 UIManager 在游戏状态变为 Dead 时通过 SetActive(true) 激活。
+            // _onPlayerDied 事件此时已经触发完毕，订阅它不会收到回调。
+            // 直接在 OnEnable 启动延迟显示协程即可保证 1.5s 缓冲。
+            StartCoroutine(ShowAfterDelay(1.5f));
+        }
 
-        private void OnEnable()  => _onPlayerDied?.Subscribe(OnPlayerDied).AddTo(_subs);
-        private void OnDisable() => _subs.Clear();
-
-        private void OnPlayerDied() => StartCoroutine(ShowAfterDelay(1.5f));
+        private void OnDisable()
+        {
+            StopAllCoroutines();
+        }
 
         private IEnumerator ShowAfterDelay(float delay)
         {
@@ -30,7 +35,6 @@ namespace BaseGames.UI.Menus
 
         private void Show()
         {
-            gameObject.SetActive(true);
             if (_btnRespawn != null)
             {
                 _btnRespawn.onClick.RemoveAllListeners();