fix: restore missing method

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

@@ -0,0 +1,17 @@
+namespace OCES.Audio
+{
+    public partial class MusicContainerConfig
+    {
+        /// <summary>
+        /// 解析拍号字符串（如 "4/4", "3/4"），返回每小节拍数。
+        /// </summary>
+        public static int GetBeatsPerBar(string timeSig)
+        {
+            if (string.IsNullOrEmpty(timeSig)) return 4;
+            string[] parts = timeSig.Split('/');
+            if (parts.Length >= 1 && int.TryParse(parts[0], out int beats))
+                return beats;
+            return 4;
+        }
+    }
+}

Assets/Scripts/OCES/Audio/HandWritten/LongAudio/MusicContainer.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 912df68e106949ff8e532be855ddd448
+timeCreated: 1776308995