摄像机区域的架构改动

Assets/_Game/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;
+using BaseGames.Core.Events;
+
+namespace BaseGames.Audio
+{
+    /// <summary>
+    /// 挂载于 PlayerController 所在 GameObject。
+    /// 订阅 EVT_LiquidEntered / EVT_LiquidExited 事件频道（与 WaterDangerState、UnderwaterPostProcessingController 一致）。
+    /// 切换 AudioMixer Snapshot 以应用/解除水下 DSP 处理。
+    /// 仅响应 Water 类型液体；Acid / Lava 不切换水下音频。
+    /// </summary>
+    public class UnderwaterAudioController : MonoBehaviour
+    {
+        [SerializeField] private AudioMixer           _mixer;
+        [SerializeField] private float                _transitionDuration = 0.3f;
+
+        [Header("Event Channels")]
+        [SerializeField] private LiquidEventChannelSO _onLiquidEntered;   // EVT_LiquidEntered
+        [SerializeField] private LiquidEventChannelSO _onLiquidExited;    // EVT_LiquidExited
+
+        private readonly CompositeDisposable _subs = new();
+
+        private void OnEnable()
+        {
+            _onLiquidEntered?.Subscribe(OnLiquidEntered).AddTo(_subs);
+            _onLiquidExited?.Subscribe(OnLiquidExited).AddTo(_subs);
+        }
+
+        private void OnDisable() => _subs.Clear();
+
+        private void OnLiquidEntered(LiquidEvent evt)
+        {
+            if (evt.LiquidType == LiquidType.Water)
+                EnterWater();
+        }
+
+        private void OnLiquidExited(LiquidEvent evt)
+        {
+            if (evt.LiquidType == LiquidType.Water)
+                ExitWater();
+        }
+
+        /// <summary>切换至水下 AudioMixer Snapshot。</summary>
+        public void EnterWater()
+        {
+            _mixer?.FindSnapshot("Underwater")?.TransitionTo(_transitionDuration);
+        }
+
+        /// <summary>切换回默认 AudioMixer Snapshot。</summary>
+        public void ExitWater()
+        {
+            _mixer?.FindSnapshot("Default")?.TransitionTo(_transitionDuration);
+        }
+    }
+}