chore: initial commit

Assets/Scripts/Core/Events/DifficultyChangedEventChannel.cs

@@ -0,0 +1,12 @@
+using UnityEngine;
+
+namespace BaseGames.Core.Events
+{
+    /// <summary>
+    /// 难度变更事件频道。Phase 2 难度系统使用。
+    /// 发布：DifficultyScalerSO / SettingsManager
+    /// 订阅：所有需要感知当前难度的系统
+    /// </summary>
+    [CreateAssetMenu(menuName = "Events/DifficultyChanged")]
+    public class DifficultyChangedEventChannel : BaseEventChannelSO<DifficultyLevel> { }
+}