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/Starter.gd

@@ -172,7 +172,7 @@ func beforeOpen(_args: Array = []):
 	for field in OutGameStorage.upgradableFieldsAdvance:
 		var fieldShow = ComponentManager.getUIComponent("FieldShow").instantiate() as FieldShow
 		fieldShow.cost(ItemStore.ItemType.CRYSTAL, 50)
-		fieldShow.cost(ItemStore.ItemType.DIAMOND, 1)
+		fieldShow.cost(ItemStore.ItemType.DIAMOND, 0)
 		fieldShow.upgradable = true
 		fieldShow.upgradeValue = OutGameStorage.upgradableFieldsAdvance[field]
 		fieldShow.field = field
@@ -182,8 +182,12 @@ func beforeOpen(_args: Array = []):
 			func(newValue: float):
 				OutGameStorage.upgradableFieldsValue[fieldShow.field] = newValue
 				for index in len(fieldShow.costCounts):
-					fieldShow.costCounts[index] *= GameRule.outGameUpgradeMultipiler
+					if fieldShow.costCounts[index] == 0:
+						fieldShow.costCounts[index] += 1
+					else:
+						fieldShow.costCounts[index] *= GameRule.outGameUpgradeMultipiler
 		)
 		upgradeFieldsBox.add_child(fieldShow)
 	
 	startSingleplayerBtn.disabled = false
+	Wave.current = 0