补充参战防御塔进入战斗逻辑

- 将 Inventory 中参战的防御塔数据传递到 CombatSelectForm 中
- 为防御塔的图标展示添加 TowerRepoItem 与 TowerIconArea 适配防御塔的三层 Image

Assets/GameMain/Scripts/UI/Game/UseCase/RepoFormUseCase.cs

@@ -67,11 +67,6 @@ namespace GeometryTD.UI
             InventoryParticipantUtility.NormalizeParticipantState(_fallbackInventory, MaxParticipantCount);
             return _fallbackInventory;
         }
-
-        public static BackpackInventoryData SampleInventory()
-        {
-            return InventorySeedUtility.CreateSampleInventory();
-        }
     }
 }