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/Definition/DataStruct/BackpackInventoryData.cs

@@ -34,6 +34,9 @@ namespace GeometryTD.Definition
         /// </summary>
         public List<TowerItemData> Towers { get; set; } = new List<TowerItemData>();
 
+        /// <summary>
+        /// 参与战斗的防御塔 Id。
+        /// </summary>
         public List<long> ParticipantTowerInstanceIds { get; set; } = new List<long>();
     }
 }

Assets/GameMain/Scripts/Definition/DataStruct/TowerItemData.cs

@@ -1,4 +1,6 @@
 using System;
+using Newtonsoft.Json;
+using UnityEngine;
 
 namespace GeometryTD.Definition
 {
@@ -41,7 +43,7 @@ namespace GeometryTD.Definition
         public RarityType Rarity { get; set; }
 
         public bool IsParticipatingInCombat { get; set; }
-        
+
         /// <summary>
         /// 构成该防御塔的枪口组件实例 Id。
         /// </summary>
@@ -61,5 +63,9 @@ namespace GeometryTD.Definition
         /// 防御塔独立属性，不依赖组件对象引用。
         /// </summary>
         public TowerStatsData Stats { get; set; } = new TowerStatsData();
+
+        [JsonIgnore] public Sprite ComposedIconSprite { get; set; }
+
+        [JsonIgnore] public string ComposedIconKey { get; set; }
     }
-}
+}