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

components/Scenes/World.tscn

@@ -18,11 +18,10 @@ position = Vector2(468, 320)
 texture = ExtResource("6_p0nkj")
 
 [node name="rooster" parent="." groups=["players"] instance=ExtResource("3_5ui6q")]
-position = Vector2(394, 274)
 
-[node name="camera" type="Camera2D" parent="rooster"]
+[node name="camera" type="Camera2D" parent="."]
 process_mode = 3
-position = Vector2(0, -100)
+offset = Vector2(0, -80)
 process_callback = 0
 position_smoothing_enabled = true
 script = ExtResource("5_mk7bv")