优化dnc，设备结构树查询，优化原有代码

lyh

2025-04-11 2cf1565485060fd56e1f1f1cffbba7a4d70d42a6

 lxzn-module-dnc/src/main/java/org/jeecg/modules/dnc/service/impl/ProductMixServiceImpl.java

@@ -19,6 +19,10 @@
    @Autowired
    private IPermissionStreamNewService permissionStreamNewService;

    /**
     * 默认结构树查询
     * @return
     */
    @Override
    public List<ProductMix> getTree() {
        LoginUser loginUser = (LoginUser) SecurityUtils.getSubject().getPrincipal();