feat: 补全多云资产与账单同步

- 接入 AWS、华为云和 Azure 资产及账单 API

- 按原始币种隔离统计并修正账号服务器数

- 修复侧栏菜单展开后的滚动行为

backend/pkg/billingsync/sync.go

@@ -95,8 +95,15 @@ func syncAccount(db *gorm.DB, account model.CloudAccount, billingDate string) (c
 
 	accountID := account.ID
 	accountName := account.Name
+	billingCurrency := records[0].Currency
+	if billingCurrency == "" {
+		billingCurrency = "CNY"
+	}
 
 	for _, rec := range records {
+		if rec.Currency == "" {
+			rec.Currency = billingCurrency
+		}
 		var existing model.CloudBilling
 		findErr := db.Where(
 			"cloud_account_id = ? AND billing_date = ? AND provider = ? AND service = ? AND region = ?",
@@ -145,9 +152,12 @@ func syncAccount(db *gorm.DB, account model.CloudAccount, billingDate string) (c
 	monthStart := billingDate[:7] + "-01"
 	var monthCost float64
 	db.Model(&model.CloudBilling{}).
-		Where("cloud_account_id = ? AND billing_date >= ?", accountID, monthStart).
+		Where("cloud_account_id = ? AND billing_date >= ? AND currency = ?", accountID, monthStart, billingCurrency).
 		Select("COALESCE(SUM(cost), 0)").Scan(&monthCost)
-	db.Model(&account).Update("monthly_cost", monthCost)
+	db.Model(&account).Updates(map[string]interface{}{
+		"monthly_cost":     monthCost,
+		"billing_currency": billingCurrency,
+	})
 
 	return created, updated, skipped, nil
 }