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/Core/Events/LiquidEvent.cs

@@ -7,10 +7,10 @@ namespace BaseGames.Core.Events
     {
         /// <summary>液体区域标识符（对应 LiquidZone SO 的 zoneId）。</summary>
         public readonly string ZoneId;
-        /// <summary>液体类型（如 "Water" / "Acid" / "Lava"）。</summary>
-        public readonly string LiquidType;
+        /// <summary>液体类型（枚举直接比较，无字符串转换）。</summary>
+        public readonly LiquidType LiquidType;
 
-        public LiquidEvent(string zoneId, string liquidType)
+        public LiquidEvent(string zoneId, LiquidType liquidType)
         {
             ZoneId     = zoneId;
             LiquidType = liquidType;