(client)feat:添加UI管理器，统一管理继承自UIBase的UI并保证显示唯一

Client/Assets/Scripts/UI/UIBase.cs

@@ -0,0 +1,15 @@
+using UnityEngine;
+
+namespace UI
+{
+    public abstract class UIBase:MonoBehaviour
+    {
+        public KeyCode actionButton = KeyCode.None;
+        // 显示或隐藏窗口
+        public virtual void Show() { gameObject.SetActive(true); }
+        public virtual void Hide() { gameObject.SetActive(false); }
+
+        // 判断是否可见
+        public bool IsVisible => gameObject.activeInHierarchy;
+    }
+}