feat: role management page with component tree (#5675)

* feat: add shadcn tree

* fix: update vbenTree component

* feat: role management demo page

* feat: add cellSwitch renderer for vxeTable

* chore: remove tree examples

apps/backend-mock/middleware/1.api.ts

@@ -13,7 +13,7 @@ export default defineEventHandler(async (event) => {
     ['DELETE', 'PATCH', 'POST', 'PUT'].includes(event.method) &&
     event.path.startsWith('/api/system/')
   ) {
-    await sleep(Math.floor(Math.random() * 1000));
+    await sleep(Math.floor(Math.random() * 2000));
     return forbiddenResponse(event, '演示环境，禁止修改');
   }
 });