feat: 添加局外养成系统和游戏结束面板改进

添加新的物品类型紫水晶和钻石
实现局外属性升级系统
改进游戏结束面板的返回和退出功能
添加新的UI组件用于显示属性和物品
更新游戏规则和存储系统以支持局外养成

scripts/Contents/Panels/GameOver.gd

@@ -1,10 +1,30 @@
 @tool
 extends FullscreenPanelBase
 
-@onready var audio: AudioStreamPlayer2D = $"%audio"
-@onready var deadreason: RichTextLabel = $"%deadreason"
+@onready var audio: AudioStreamPlayer2D = $%audio
+@onready var deadreason: RichTextLabel = $%deadreason
+@onready var returnBtn: Button = $%returnBtn
+@onready var exitBtn: Button = $%exitBtn
+
+func _ready():
+	returnBtn.pressed.connect(
+		func():
+			returnBtn.disabled = true
+			for bullet in get_tree().get_nodes_in_group("bullets"):
+				bullet.queue_free()
+			for entity in get_tree().get_nodes_in_group("entities"):
+				entity.queue_free()
+			UIState.setPanel("Starter")
+	)
+	exitBtn.pressed.connect(
+		func():
+			get_tree().quit()
+	)
 
 func beforeOpen(args: Array = []):
 	audio.play()
 	var reasonTemplate = MathTool.randomChoiceFrom(GameRule.deadReasons)
 	deadreason.text = ("[color=gray]" + reasonTemplate + "凶手是[b]%s[/b]的[b]%s[/b]。[/color]") % args
+func afterOpen(_args: Array = []):
+	returnBtn.disabled = false
+	exitBtn.disabled = false