添加节点测试 UI 和商店节点（占位）

- TestMenuForm：节点测试 UI
- ShopNodeComponent：商店节点组件，只有 OnInit() 和 StartShop() 两个空方法

Assets/GameMain/Scripts/Base/GameEntry.Custom.cs

@@ -23,6 +23,8 @@ public partial class GameEntry : MonoBehaviour
     public static EventNodeComponent EventNode { get; private set; }
 
     public static CombatNodeComponent CombatNode { get; private set; }
+    
+    public static ShopNodeComponent ShopNode { get; private set; }
 
     private static void InitCustomComponents()
     {
@@ -31,5 +33,6 @@ public partial class GameEntry : MonoBehaviour
         UIRouter = UnityGameFramework.Runtime.GameEntry.GetComponent<UIRouterComponent>();
         EventNode = UnityGameFramework.Runtime.GameEntry.GetComponent<EventNodeComponent>();
         CombatNode = UnityGameFramework.Runtime.GameEntry.GetComponent<CombatNodeComponent>();
+        ShopNode = UnityGameFramework.Runtime.GameEntry.GetComponent<ShopNodeComponent>();
     }
 }