feat: SSO 로그인 리다이렉션 흐름 구현 (userfront & adminfront 연동) #243

userfront/lib/core/services/web_auth_integration_web.dart

@@ -5,6 +5,21 @@ import 'dart:html' as html;
 import 'package:flutter/foundation.dart';
 
 void implSendLoginSuccess(String token) {
+  final uri = Uri.parse(html.window.location.href);
+  final redirectUri = uri.queryParameters['redirect_uri'];
+
+  if (redirectUri != null && redirectUri.isNotEmpty) {
+    // Redirection flow
+    final target = Uri.parse(redirectUri);
+    final query = Map<String, String>.from(target.queryParameters);
+    query['token'] = token;
+    final finalUri = target.replace(queryParameters: query);
+    
+    debugPrint('Redirecting to: ${finalUri.toString()}');
+    html.window.location.href = finalUri.toString();
+    return;
+  }
+
   final message = {'type': 'LOGIN_SUCCESS', 'token': token};
   
   if (html.window.opener != null) {

userfront/lib/main.dart

@@ -98,6 +98,13 @@ final _router = GoRouter(
         return LoginScreen(key: state.pageKey, loginChallenge: loginChallenge);
       },
     ),
+    GoRoute(
+      path: '/ssologin',
+      builder: (context, state) {
+        _routerLogger.info("Navigating to /ssologin");
+        return LoginScreen(key: state.pageKey);
+      },
+    ),
     GoRoute(
       path: '/login',
       builder: (context, state) {