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/EntityLogic/TowerEntity.cs

@@ -5,16 +5,16 @@ using UnityGameFramework.Runtime;
 
 namespace GeometryTD.Entity
 {
-    public class DefenseTowerEntity : EntityBase
+    public class TowerEntity : EntityBase
     {
-        private DefenseTowerController _towerController;
+        private TowerController _towerController;
 
         public void SetAttackRangeVisible(bool visible)
         {
             _towerController?.SetAttackRangeVisible(visible);
         }
 
-        public bool TryApplyStats(DefenseTowerStatsData stats, int towerLevel)
+        public bool TryApplyStats(TowerStatsData stats, int towerLevel)
         {
             if (_towerController == null || stats == null)
             {
@@ -29,7 +29,7 @@ namespace GeometryTD.Entity
         {
             base.OnInit(userData);
 
-            _towerController = GetComponent<DefenseTowerController>();
+            _towerController = GetComponent<TowerController>();
             if (_towerController == null)
             {
                 Log.Error("DefenseTowerController is missing on tower entity '{0}'.", name);
@@ -45,7 +45,7 @@ namespace GeometryTD.Entity
                 return;
             }
 
-            if (userData is not DefenseTowerData towerData)
+            if (userData is not TowerData towerData)
             {
                 Log.Warning("DefenseTowerData is invalid for tower entity '{0}'.", Id);
                 _towerController.OnReset();