补全防御塔组装与介绍描述功能

- RepoForm.CombineArea：防御塔组装，直接继承所有组件的属性
- ItemDescUtility：根据属性构建不同的 ItemDescForm 的文本

Assets/GameMain/Scripts/Entity/EntityData/TowerData.cs

@@ -5,25 +5,25 @@ using UnityEngine;
 namespace GeometryTD.Entity.EntityData
 {
     [Serializable]
-    public class DefenseTowerData : EntityDataBase
+    public class TowerData : EntityDataBase
     {
-        [SerializeField] private DefenseTowerStatsData _stats = new DefenseTowerStatsData();
+        [SerializeField] private TowerStatsData _stats = new TowerStatsData();
         [SerializeField] private int _towerLevel = 0;
 
-        public DefenseTowerData(int entityId, int typeId, Vector3 position, Quaternion rotation,
-            DefenseTowerStatsData stats, int towerLevel = 0)
+        public TowerData(int entityId, int typeId, Vector3 position, Quaternion rotation,
+            TowerStatsData stats, int towerLevel = 0)
             : base(entityId, typeId)
         {
             Position = position;
             Rotation = rotation;
-            _stats = stats ?? new DefenseTowerStatsData();
+            _stats = stats ?? new TowerStatsData();
             _towerLevel = Mathf.Max(0, towerLevel);
         }
 
-        public DefenseTowerStatsData Stats
+        public TowerStatsData Stats
         {
             get => _stats;
-            set => _stats = value ?? new DefenseTowerStatsData();
+            set => _stats = value ?? new TowerStatsData();
         }
 
         public int TowerLevel