chore: demo page for system/department (#5611)

* feat: department management demo

* perf: department page improve

* feat: demo api middleware

* fix: add losing import

apps/backend-mock/api/system/dept/.post.ts

@@ -0,0 +1,15 @@
+import { verifyAccessToken } from '~/utils/jwt-utils';
+import {
+  sleep,
+  unAuthorizedResponse,
+  useResponseSuccess,
+} from '~/utils/response';
+
+export default eventHandler(async (event) => {
+  const userinfo = verifyAccessToken(event);
+  if (!userinfo) {
+    return unAuthorizedResponse(event);
+  }
+  await sleep(600);
+  return useResponseSuccess(null);
+});