refactor(service): 移除查询中未使用的tags字段

src/service/customer.service.ts

@@ -370,8 +370,7 @@ export class CustomerService {
         'c.created_at',
         'c.updated_at',
         'c.site_created_at',
-        'c.site_updated_at',
-        'GROUP_CONCAT(ct.tag) as tags'
+        'c.site_updated_at'
       ])
       .groupBy('c.id');