orgfront refresh token 관리 추가

userfront/lib/features/auth/presentation/signup_screen.dart

@@ -3,7 +3,6 @@ import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:go_router/go_router.dart';
-import 'package:url_launcher/url_launcher.dart';
 import 'package:userfront/i18n.dart';
 import '../../../core/i18n/locale_utils.dart';
 import '../../../core/services/auth_proxy_service.dart';
@@ -39,7 +38,6 @@ class _SignupScreenState extends State<SignupScreen> {
   bool _isEmailVerified = false;
   bool _isPhoneVerified = false;
   String _affiliationType = 'GENERAL';
-  bool _isAffiliateLocked = false;
   String? _companyCode;
   bool _termsAccepted = false;
   bool _privacyAccepted = false;
@@ -283,11 +281,9 @@ class _SignupScreenState extends State<SignupScreen> {
 
           if (res['isAffiliate'] == true) {
             _affiliationType = 'AFFILIATE';
-            _isAffiliateLocked = true;
           } else {
             _affiliationType = 'GENERAL';
             _companyCode = null;
-            _isAffiliateLocked = true;
           }
         });