WIP: Music callback

- 头几拍会抖动一下，导致对不上拍子

Assets/Scripts/OCES/Audio/HandWritten/LongAudio/AmbienceChannelPlayer.cs

@@ -7,7 +7,7 @@ namespace OCES.Audio
     /// 环境音通道播放器。
     /// 与 MusicChannelPlayer 逻辑相同，但使用 AmbienceTransition 表，不涉及节拍对齐。
     /// </summary>
-    public class AmbienceChannelPlayer
+    class AmbienceChannelPlayer
     {
         readonly AmbienceTransitionConfig m_transitionConfig;
         readonly MonoBehaviour m_coroutineHost;
@@ -20,7 +20,7 @@ namespace OCES.Audio
         
         uint m_currentContainerId;
 
-        public AmbienceChannelPlayer(
+        internal AmbienceChannelPlayer(
             AmbienceTransitionConfig transitionConfig,
             MusicContainerPlayer player,
             MonoBehaviour coroutineHost)
@@ -34,7 +34,7 @@ namespace OCES.Audio
         // 公开接口
         // ─────────────────────────────────────────────
 
-        public void SwitchTo(uint newContainerId, uint fromPathId, uint toPathId)
+        internal void SwitchTo(uint newContainerId, uint fromPathId, uint toPathId)
         {
             if (newContainerId == this.m_currentContainerId && this.m_currentHandle != null)
                 return;