fix: frontend custom server 삭제, 회원가입 수정

frontend/portal/server/index.ts

@@ -1,31 +0,0 @@
-import { loadEnvConfig } from '@next/env'
-import cors from 'cors'
-import express, { Request, Response } from 'express'
-import next from 'next'
-loadEnvConfig('./', process.env.NODE_ENV !== 'production')
-
-const port = process.env.PORT || 3000
-const dev = process.env.NODE_ENV !== 'production'
-const app = next({ dev })
-const handle = app.getRequestHandler()
-
-const startServer = async () => {
-  try {
-    await app.prepare()
-    const server = express()
-    server.use(cors())
-    server.all('*', (req: Request, res: Response) => {
-      return handle(req, res)
-    })
-
-    server.listen(port, (err?: any) => {
-      if (err) throw err
-      console.info(`> Ready on localhost:${port} - env ${process.env.NODE_ENV}`)
-    })
-  } catch (error) {
-    console.error(error)
-    process.exit(1)
-  }
-}
-
-startServer()