fix: basepath did not read from the environment variable (#24870)

web/next.config.js

-const { basePath, assetPrefix } = require('./utils/var-basePath')
 const { codeInspectorPlugin } = require('code-inspector-plugin')
 const withMDX = require('@next/mdx')({
   extension: /\.mdx?$/,
 
 /** @type {import('next').NextConfig} */
 const nextConfig = {
-  basePath,
-  assetPrefix,
+  basePath: process.env.NEXT_PUBLIC_BASE_PATH || '',
   webpack: (config, { dev, isServer }) => {
     if (dev) {
       config.plugins.push(codeInspectorPlugin({ bundler: 'webpack' }))

web/utils/var-basePath.js

-// export basePath to next.config.js
-// same as the one exported from var.ts
-module.exports = {
-  basePath: process.env.NEXT_PUBLIC_BASE_PATH || '',
-  assetPrefix: '',
-}

web/utils/var.ts

 
 // Set the value of basePath
 // example: /dify
-export const basePath = ''
+export const basePath = process.env.NEXT_PUBLIC_BASE_PATH || ''
 
 export function getMarketplaceUrl(path: string, params?: Record<string, string | undefined>) {
   const searchParams = new URLSearchParams({ source: encodeURIComponent(window.location.origin) })