feat: 用户新增增加用户名重复校验

kh-module-system/src/main/java/com/jero/modules/system/service/impl/SysUserServiceImpl.java

@@ -474,7 +474,12 @@ public class SysUserServiceImpl extends ServiceImpl<SysUserMapper, SysUser> impl
 				throw new JeroBootException("手机号已存在，请重新输入");
 			}
 		}
-
+		LambdaQueryWrapper<SysUser> queryWrapper = new LambdaQueryWrapper<>();
+		queryWrapper.eq(SysUser::getUsername, user.getUsername());
+		int count = userMapper.selectCount(queryWrapper);
+		if (count > 0) {
+			throw new JeroBootException("用户名已存在，请重新输入");
+		}
 		//step.1 保存用户
 		// 对手机号、邮箱进行加密处理
 		this.proceedUserInfoEncrypt(user);