fix: 修复mock里面eventHandler重复导致无法启动 (#6631)

Author: gxc685

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

@@ -1,3 +1,4 @@
+import { eventHandler } from 'h3';
 import { verifyAccessToken } from '~/utils/jwt-utils';
 import {
   sleep,
@@ -13,6 +14,3 @@ export default eventHandler(async (event) => {
   await sleep(600);
   return useResponseSuccess(null);
 });
-function eventHandler(_: (event: any) => Promise<any>) {
-  throw new Error('Function not implemented.');
-}