用户初始化时，导出密钥强制全小写

src/main/java/com/qmth/ops/biz/service/UserService.java

@@ -30,7 +30,7 @@ public class UserService extends ServiceImpl<UserDao, User> {
 
     @Transactional
     public User insert(User user) {
-        user.setExportSecret(RandomStringUtils.random(16, true, true));
+        user.setExportSecret(RandomStringUtils.random(16, true, true).toLowerCase());
         user.setCreateTime(System.currentTimeMillis());
         user.setUpdateTime(user.getCreateTime());
         user.setPassword(user.buildPassword(user.getPassword()));