death sounds, build sounds, better audio management

Assets/_Project/Scripts/Combat/TowerBuiltSound.cs

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+// Assets/_Project/Scripts/Combat/TowerBuiltSound.cs
+using TD.Audio;
+using TD.Gameplay;
+using UnityEngine;
+
+namespace TD.Combat
+{
+    /// <summary>
+    /// Local-only audio for tower construction completion. Subscribes to
+    /// <see cref="TowerInstance.OnBuiltClient"/> and plays a sound on every peer
+    /// when the tower finishes building.
+    /// Attach to any tower prefab and assign its clip in the Inspector.
+    /// </summary>
+    [RequireComponent(typeof(TowerInstance))]
+    public class TowerBuiltSound : MonoBehaviour
+    {
+        [SerializeField] private SoundConfig builtSound;
+
+        private TowerInstance towerInstance;
+
+        private void Awake()
+        {
+            towerInstance = GetComponent<TowerInstance>();
+        }
+
+        private void OnEnable()
+        {
+            if (towerInstance != null) towerInstance.OnBuiltClient += HandleBuilt;
+        }
+
+        private void OnDisable()
+        {
+            if (towerInstance != null) towerInstance.OnBuiltClient -= HandleBuilt;
+        }
+
+        private void HandleBuilt()
+        {
+            AudioManager.Instance?.Play(builtSound.clip, AudioCategory.UI, builtSound.RandomPitch(), builtSound.volume);
+        }
+    }
+}