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)