refactor(advert_cost): 重构广告费用计算逻辑

-增加对美国站点的支持
- 优化日本站点的数据处理方式- 添加默认值处理，避免空值导致的错误
- 修复花费金额的数据类型问题

app/vc/advert_cost.py

@@ -117,12 +117,17 @@ class AdvertCost(AutoInterface):
         data = pd.read_excel(self.result_file_name, keep_default_na=False, na_values=[])
 
         for _, item_row in data.iterrows():
+            if self.country == "US":
                 asin = item_row.get('Products', '').split("-")[0]
-            spend = item_row.get('Spend(USD)', ''),  # 金额
-
-            if self.country == 'JP':
+                spend = item_row.get('Spend(USD)', 0.00),  # 金额
+            elif self.country == "JP":
                 asin = item_row.get('商品', '').split("-")[0]
-                spend = item_row.get('花费(JPY)', ''),  # 金额
+                spend = item_row.get('花费(JPY)', 0.00),  # 金额
+                if isinstance(spend, tuple):
+                    spend = float(spend[0])
+            else:
+                asin = ''
+                spend = 0.00
 
             push_data = {
                 'asin': asin,  # ASIN