feat(UI): 添加武器面板功能

实现武器面板的打开关闭逻辑，包括：
- 创建WeaponPanel脚本处理武器转移
- 在UIState中添加武器面板输入控制
- 更新UI场景添加武器面板节点
- 简化武器面板场景结构

scripts/Contents/Panels/GameOver.gd

@@ -1,3 +1,4 @@
+@tool
 extends FullscreenPanelBase
 
 @onready var audio = $"%audio"

scripts/Contents/Panels/WeaponPanel.gd

@@ -0,0 +1,13 @@
+@tool
+extends FullscreenPanelBase
+
+@onready var box = $"%box"
+
+func beforeOpen():
+	for weapon in UIState.player.weapons:
+		UIState.player.weaponStore.remove_child(weapon)
+		box.add_child(weapon)
+func afterClose():
+	for weapon in box.get_children():
+		box.remove_child(weapon)
+		UIState.player.weaponStore.add_child(weapon)

scripts/Statemachine/UIState.gd

@@ -49,6 +49,16 @@ func _physics_process(_delta):
 				closeCurrentPanel()
 		else:
 			setPanel("Pause")
+	if Input.is_action_just_pressed("openWeapon"):
+		var canOpen = true
+		if currentPanel:
+			if currentPanel.name == "Weapon":
+				closeCurrentPanel()
+				canOpen = false
+			elif ["MakeFeed", "GameOver"].has(currentPanel.name):
+				canOpen = false
+		if canOpen:
+			setPanel("Weapon")
 
 static func setPanel(targetName: String = ""):
 	currentPanel = null