fix(UI): 修正能量显示格式和动画问题

修复能量标签显示格式从"%.1f"改为"%.2f"
调整BigLaser能量消耗从50改为100
修复ItemShow动画资源顺序错误问题
添加autoFree属性到UI场景中的物品节点
修改FieldShow默认文本从"+0"改为"0"

scripts/Statemachine/UIState.gd

@@ -24,7 +24,7 @@ func _process(_delta):
 	bossbar.visible = !!bossbar.entity
 func _physics_process(_delta):
 	if is_instance_valid(player):
-		energyLabel.text = "%.1f" % player.energy
+		energyLabel.text = "%.2f" % player.energy
 		energyMaxLabel.text = "%.1f" % player.fields.get(FieldStore.Entity.MAX_ENERGY)
 		for i in items.get_children():
 			var item = i as ItemShow