[skip ci] fix condition in Next.js API proxy resource

pages/api/proxy.ts

@@ -4,10 +4,11 @@ import type { NextApiRequest, NextApiResponse } from 'next';
 import fetchFactory from 'nextjs/utils/fetchProxy';
 
 import appConfig from 'configs/app';
+import isNeedProxy from 'lib/api/isNeedProxy';
 
 const handler = async(nextReq: NextApiRequest, nextRes: NextApiResponse) => {
 
-  if (!appConfig.app.useProxy) {
+  if (!isNeedProxy()) {
     nextRes.status(404).json({ error: 'Not found' });
     return;
   }