fix: avoid root route conflict in dynamic route generation

- getRouters returns a menu with path='/' and component='Layout'
- This conflicts with the constant '/' route that redirects to '/index'
- Flatten such menus to their children to preserve the original root redirect
- This fixes the issue where getRouters success was followed by another /login call

ruoyi-ui-next/src/stores/modules/permission.ts

@@ -55,7 +55,13 @@ export const usePermissionStore = defineStore('permission', () => {
   function filterAsyncRouter(menuList: any[]): RouteRecordRaw[] {
     return menuList
       .filter((menu: any) => menu.visible !== '1' || menu.children)
-      .map((menu: any) => {
+      .flatMap((menu: any) => {
+        // 如果顶级菜单 path 是 '/' 且 component 是 Layout，
+        // 直接展开它的 children，避免与 constantRoutes 中的 '/' 路由冲突
+        if (menu.path === '/' && menu.component === 'Layout' && menu.children) {
+          return filterAsyncRouter(menu.children)
+        }
+
         const route: any = {
           path: menu.path,
           name: menu.name || convertRouteName(menu.path),