多轮审查和修复

Assets/Scripts/Audio/UnderwaterAudioController.cs

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+// Assets/Scripts/Audio/UnderwaterAudioController.cs
+// 进入 LiquidZone 时切换水下 DSP 处理（Architecture 21_LiquidPuzzleModule §3.4）
+using UnityEngine;
+using UnityEngine.Audio;
+
+namespace BaseGames.Audio
+{
+    /// <summary>
+    /// 挂载于 PlayerController 所在 GameObject。
+    /// 由 LiquidZone.OnTriggerEnter2D / OnTriggerExit2D 直接调用。
+    /// 切换 AudioMixer Snapshot 以应用/解除水下 DSP 处理。
+    /// </summary>
+    public class UnderwaterAudioController : MonoBehaviour
+    {
+        [SerializeField] private AudioMixer _mixer;
+        [SerializeField] private float      _transitionDuration = 0.3f;
+
+        /// <summary>玩家进入 Water 类型液体时调用。</summary>
+        public void EnterWater()
+        {
+            _mixer?.FindSnapshot("Underwater")?.TransitionTo(_transitionDuration);
+        }
+
+        /// <summary>玩家离开液体时调用。</summary>
+        public void ExitWater()
+        {
+            _mixer?.FindSnapshot("Default")?.TransitionTo(_transitionDuration);
+        }
+    }
+}