feat(相机管理): 添加CameraManager类并实现玩家跟随

refactor(物品展示): 修改ItemShow状态机自动隐藏逻辑

feat(游戏逻辑): 添加玩家死亡时的游戏结束界面

style(场景配置): 调整World场景中相机节点位置和偏移

feat(UI): 为ItemShow添加显示动画并更新动画库

scripts/Statemachine/EntityBase.gd

@@ -188,7 +188,9 @@ func tryDie(by: BulletBase):
 	if MathTool.rate(GameRule.appleDropRate + by.launcher.fields.get(FieldStore.Entity.DROP_APPLE_RATE)) or isBoss:
 		for i in randi_range(appleCount.x, appleCount.y):
 			ItemDropped.generate(ItemStore.ItemType.APPLE, 1, position + MathTool.randv2_range(GameRule.itemDroppedSpawnOffset))
-	die()
+	await die()
+	if isPlayer() and UIState.player == self:
+		UIState.setPanel("GameOver")
 func tryHeal(count: float):
 	if inventory[ItemStore.ItemType.APPLE] > 0 and health < fields.get(FieldStore.Entity.MAX_HEALTH):
 		inventory[ItemStore.ItemType.APPLE] -= 1

scripts/Statemachine/ItemShow.gd

@@ -12,6 +12,8 @@ class_name ItemShow
 
 func _ready():
 	if autoFree:
+		animator.play("show")
+		await animator.animation_finished
 		await TickTool.millseconds(GameRule.itemShowStayTime) # 等待几秒后自动隐藏
 		animator.play("hide")
 		await animator.animation_finished