feat(战斗系统): 添加KukeMC召唤机制及子实体管理

为KukeMC添加召唤子实体KukeChild的功能，并在血量低于25%时自动清除所有子实体并恢复血量
在EntityBase中添加tryKill方法统一处理实体销毁逻辑
在EntityTool中添加按类查找实体的工具方法

scripts/Contents/Characters/KukeChild.gd

@@ -1,4 +1,5 @@
 extends EntityBase
+class_name KukeChild
 
 var masterMine: KukeMC
 
@@ -12,11 +13,12 @@ func ai():
 	tryAttack(0)
 	tryAttack(1)
 	if timeLived() > 10000:
-		masterMine.tryHeal(100)
-		tryDie(null)
+		tryKill()
 func attack(type):
 	if type == 0:
 		BulletBase.generate(preload("res://components/Bullets/PurpleCrystalSmall.tscn"), self, findWeaponAnchor("normal"), position.angle_to_point(currentFocusedBoss.position))
 		await TickTool.millseconds(randi_range(5, 25))
 	elif type == 1:
 		BulletBase.generate(preload("res://components/Bullets/BossAttack/KukeMC/HeavyCrystal.tscn"), self, findWeaponAnchor("normal"), position.angle_to_point(currentFocusedBoss.position))
+func kill():
+	masterMine.tryHeal(100)