Refactor event channels and update layer specifications

- Removed StatusEffectEventChannelSO and its associated meta file.
- Updated CreateEventChannelAssets to handle new shield-related events.
- Added CharmModule for managing charm assets in the DataHub.
- Introduced CharmEventChannelSO for charm equipped/unequipped events.
- Changed layer references from "Ground" to "Platform" in various scripts.
- Updated documentation to reflect changes in layer specifications.
- Created new event assets for ShieldBroken, ShieldRestored, StatusEffectApplied, and StatusEffectExpired.

Assets/_Game/Scripts/Equipment/CharmEventChannelSO.cs

@@ -0,0 +1,11 @@
+using UnityEngine;
+using BaseGames.Core.Events;
+
+namespace BaseGames.Equipment
+{
+    /// <summary>
+    /// 护符事件频道（EVT_CharmEquipped / EVT_CharmUnequipped）。
+    /// </summary>
+    [CreateAssetMenu(menuName = "BaseGames/Events/CharmEvent")]
+    public class CharmEventChannelSO : BaseEventChannelSO<CharmSO> { }
+}