Add SoundEffect audio system (ScriptableObject-based) with test assets

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Assets/Scripts/Audio/SoundEffectDistanceRange.cs

@@ -0,0 +1,10 @@
+using UnityEngine;
+
+namespace Prototype
+{
+    [CreateAssetMenu(menuName = "Prototype/Sound Effect Distance Range")]
+    public class SoundEffectDistanceRange : UnityEngine.ScriptableObject
+    {
+        public Vector2 range = new SoundEffectOptions().GetDistanceRange();
+    }
+}