重构：统一 UI 模块目录结构规范

- 事件命名规范化：RefreshEventArgs → LevelUpRefreshEventArgs
- LevelUp 子组件目录调整：LevelUpRewardItem + LevelUpRewardItemContext 移动到 LevelUp/
- Shop 子组件目录调整：DisplayItem/DisplayListArea/GoodsItem/ShopGoodsItem 及其 Context/RawData 全部移动到 Shop/
- 删除冗余文件：LevelUpRewardItemRawData（从未被使用）
- 新增 ObjectPool 目录结构
- 更新 LevelUpController 和 LevelUpForm 中的事件引用

Assets/GameMain/Scripts/Presentation/Main/Shop/DisplayItemContext.cs

@@ -0,0 +1,25 @@
+using SepCore.Definition;
+
+namespace SepCore.UI
+{
+    public class DisplayItemContext : UIContext
+    {
+        public string IconAssetName;
+        public ItemRarity Rarity;
+        public bool IsWeapon;
+
+        public DisplayItemContext()
+        {
+            IconAssetName = string.Empty;
+            Rarity = ItemRarity.None;
+            IsWeapon = false;
+        }
+        
+        public DisplayItemContext(DisplayItemRawData rawData)
+        {
+            this.IconAssetName = rawData.IconAssetName;
+            this.Rarity = rawData.Rarity;
+            this.IsWeapon = rawData.IsWeapon;
+        }
+    }
+}