fix: SysLoginServiceImpl.alwaysShow 逻辑修正 — 有子路由时设为 true

Co-Authored-By: Claude <noreply@anthropic.com>

custom-server-app/src/main/java/com/jomalls/custom/app/service/system/impl/SysLoginServiceImpl.java

@@ -155,8 +155,8 @@ public class SysLoginServiceImpl implements SysLoginService {
                 List<RouterVO> children = buildRouterTree(menu.getMenuId(), allMenus);
                 router.setChildren(children.isEmpty() ? null : children);
                 // 有子路由时设置 alwaysShow
-                if (children.isEmpty()) {
-                    router.setAlwaysShow(null);
+                if (!children.isEmpty()) {
+                    router.setAlwaysShow(Boolean.TRUE);
                 }
 
                 return router;