```

feat(gameplay): 更新单位属性和材质配置

- 调整多个单位的基础生命值和攻击力数值平衡
- 修改CoreBattleGround材质的纹理缩放比例
- 更新地砖材质颜色为白色
- 优化纹理资源设置，调整最大纹理尺寸并添加PlayableAds平台支持
- 修复弓箭手技能目标查找逻辑，改用统一的敌人检测方法
- 为水晶矿添加中立阵营设置和光球视觉效果同步
- 调整预制体中的全局缩放参数
- 为狼人和石巨人添加NavMeshAgent组件支持
- 优化水晶矿血条显示位置计算方式
```

Assets/Script/ArcherSkill.cs

@@ -44,30 +44,6 @@ public class ArcherSkill : UnitSkill
 
     private GameObject FindNearestOpponent()
     {
-        string opponentTag = unit.OpponentTag;
-        if (string.IsNullOrEmpty(opponentTag))
-        {
-            return null;
-        }
-
-        GameObject nearestOpponent = null;
-        float nearestSqrDistance = float.PositiveInfinity;
-        GameObject[] opponents = GameObject.FindGameObjectsWithTag(opponentTag);
-        foreach (GameObject opponent in opponents)
-        {
-            if (opponent == null || opponent.transform.root == unit.transform.root)
-            {
-                continue;
-            }
-
-            float sqrDistance = (opponent.transform.position - unit.transform.position).sqrMagnitude;
-            if (sqrDistance < nearestSqrDistance)
-            {
-                nearestSqrDistance = sqrDistance;
-                nearestOpponent = opponent;
-            }
-        }
-
-        return nearestOpponent;
+        return unit.FindNearestEnemyForSkill();
     }
 }