fix: frontend custom server 삭제, 회원가입 수정

frontend/portal/next.config.js

@@ -5,6 +5,7 @@ const port = process.env.PORT || 3000
 const serverApiUrl = process.env.SERVER_API_URL || 'http://localhost:8000'
 const siteId = process.env.SITE_ID || '3'
 const mode = siteId === '2' ? 'lg' : siteId === '3' ? 'sm' : 'sm'
+const socialLoginEnabled = process.env.SOCIAL_LOGIN_ENABLED || 'false'
 
 module.exports = {
   i18n,
@@ -14,6 +15,7 @@ module.exports = {
     MODE: mode,
     SERVER_API_URL: serverApiUrl,
     SITE_ID: siteId,
+    SOCIAL_LOGIN_ENABLED: socialLoginEnabled,
   },
   async rewrites() {
     return [