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/UI/ItemShow.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=6 format=3 uid="uid://bbm8l3hr4ihar"]
+[gd_scene load_steps=7 format=3 uid="uid://bbm8l3hr4ihar"]
 
 [ext_resource type="Script" path="res://scripts/Statemachine/ItemShow.gd" id="1_2dhsb"]
 [ext_resource type="Texture2D" uid="uid://bks8jmctleina" path="res://resources/items/baseball.svg" id="1_hyowb"]
@@ -54,10 +54,38 @@ tracks/1/keys = {
 "times": PackedFloat32Array(0, 0.5)
 }
 
+[sub_resource type="Animation" id="Animation_pv00d"]
+resource_name = "hide"
+length = 0.5
+step = 0.1
+tracks/0/type = "bezier"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath(".:scale:x")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"handle_modes": PackedInt32Array(0, 0),
+"points": PackedFloat32Array(1e-05, -0.25, 0, 0.25, 0, 1, -0.25, 0, 0.25, 0),
+"times": PackedFloat32Array(0, 0.5)
+}
+tracks/1/type = "bezier"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath(".:modulate:a")
+tracks/1/interp = 1
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"handle_modes": PackedInt32Array(0, 0),
+"points": PackedFloat32Array(0, -0.25, 0, 0.25, 0, 1, -0.25, 0, 0.25, 0),
+"times": PackedFloat32Array(0, 0.5)
+}
+
 [sub_resource type="AnimationLibrary" id="AnimationLibrary_xbbtb"]
 _data = {
 "RESET": SubResource("Animation_6sxrr"),
-"hide": SubResource("Animation_ltvf2")
+"hide": SubResource("Animation_ltvf2"),
+"show": SubResource("Animation_pv00d")
 }
 
 [node name="ItemShow" type="HBoxContainer"]