feat: 添加水晶和钻石物品系统

- 在EntityBase中新增水晶和钻石物品类型
- 敌人在死亡时概率掉落水晶，BOSS额外掉落钻石
- 游戏结束时将水晶和钻石存入OutGameStorage
- 调整Starter面板中钻石升级成本为0
- 在UI场景中添加水晶和钻石显示节点

scripts/Contents/Panels/GameOver.gd

@@ -25,6 +25,8 @@ 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
+	OutGameStorage.inventory[ItemStore.ItemType.CRYSTAL] += UIState.player.inventory[ItemStore.ItemType.CRYSTAL]
+	OutGameStorage.inventory[ItemStore.ItemType.DIAMOND] += UIState.player.inventory[ItemStore.ItemType.DIAMOND]
 func afterOpen(_args: Array = []):
 	returnBtn.disabled = false
 	exitBtn.disabled = false