SMS 인증 코드 발송 UI 및 백엔드 API 연동

frontend/lib/core/services/auth_proxy_service.dart

@@ -58,6 +58,22 @@ class AuthProxyService {
     }
   }
 
+  static Future<void> sendSms(String phoneNumber) async {
+    final url = Uri.parse('$_baseUrl/api/v1/auth/sms');
+    
+    final response = await http.post(
+      url,
+      headers: {'Content-Type': 'application/json'},
+      body: jsonEncode({
+        'phoneNumber': phoneNumber,
+      }),
+    );
+
+    if (response.statusCode != 200) {
+      throw Exception('Failed to send SMS: ${response.body}');
+    }
+  }
+
   static Future<void> logError(String message) async {
     final url = Uri.parse('$_baseUrl/api/v1/client-log');
     try {

frontend/lib/features/auth/presentation/login_screen.dart

@@ -21,6 +21,8 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
   final TextEditingController _emailController = TextEditingController();
   final TextEditingController _passwordController = TextEditingController();
   final TextEditingController _phoneController = TextEditingController();
+  final TextEditingController _smsCodeController = TextEditingController();
+  bool _smsSent = false;
 
   @override
   void initState() {
@@ -74,6 +76,7 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
     _emailController.dispose();
     _passwordController.dispose();
     _phoneController.dispose();
+    _smsCodeController.dispose();
     super.dispose();
   }
 
@@ -233,66 +236,20 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
     if (phone.isEmpty) return;
 
     try {
-      // 1. Init via Proxy
-      final initData = await AuthProxyService.initEnchantedLink(phone);
-      final pendingRef = initData['pendingRef'];
-
-      if (mounted) {
-        showDialog(
-          context: context,
-          barrierDismissible: false,
-          builder: (context) => AlertDialog(
-            title: const Text("Check your Messages"),
-            content: Column(
-              mainAxisSize: MainAxisSize.min,
-              children: [
-                Text("We sent a message to $phone"),
-                const SizedBox(height: 16),
-                const LinearProgressIndicator(),
-                const SizedBox(height: 16),
-              ],
-            ),
-          ),
-        );
-
-        // 2. Poll via Proxy
-        final pollData = await AuthProxyService.pollEnchantedLink(pendingRef);
-        
-        String sessionToken = "";
-        if (pollData['sessionToken'] is Map) {
-           sessionToken = pollData['sessionToken']['jwt'] ?? "";
-        } else if (pollData['sessionToken'] is String) {
-           sessionToken = pollData['sessionToken'];
-        }
-
-        if (sessionToken.isEmpty) {
-            throw Exception("Invalid session token received");
-        }
-
-        await AuditService.logEvent(
-          userId: phone,
-          eventType: 'login_success',
-          status: 'success',
-          details: 'Method: SMS/EnchantedLink/Proxy',
-        );
-
-        if (mounted) {
-           Navigator.of(context).pop(); // Close Dialog
-           
-           if (WebAuthIntegration.isPopup()) {
-             WebAuthIntegration.sendLoginSuccess(sessionToken);
-             _showError("Login Successful! You can close this window.");
-           } else {
-             _showError("Login Successful (Standalone)");
-           }
-        }
-      }
+      await AuthProxyService.sendSms(phone);
+      setState(() {
+        _smsSent = true;
+      });
     } catch (e) {
-      if (mounted && Navigator.canPop(context)) Navigator.of(context).pop();
-      _showError("SMS Enchanted Link Failed (Proxy): $e");
+      _showError("Failed to send SMS: $e");
     }
   }
 
+  Future<void> _handleSmsVerification() async {
+    // For now, just show a success message
+    _showSuccessDialog();
+  }
+
   void _showError(String message) {
     if (!mounted) return;
     
@@ -388,23 +345,42 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
                     // Phone/SMS Form
                     Column(
                       children: [
-                        TextField(
-                          controller: _phoneController,
-                          decoration: const InputDecoration(
-                            labelText: "Phone Number",
-                            hintText: "+82 10-1234-5678",
-                            border: OutlineInputBorder(),
-                            prefixIcon: Icon(Icons.phone_android),
+                        if (!_smsSent) ...[
+                          TextField(
+                            controller: _phoneController,
+                            decoration: const InputDecoration(
+                              labelText: "Phone Number",
+                              hintText: "+82 10-1234-5678",
+                              border: OutlineInputBorder(),
+                              prefixIcon: Icon(Icons.phone_android),
+                            ),
                           ),
-                        ),
-                        const SizedBox(height: 24),
-                        FilledButton(
-                          onPressed: _handleSmsLogin,
-                          style: FilledButton.styleFrom(
-                            minimumSize: const Size.fromHeight(50),
+                          const SizedBox(height: 24),
+                          FilledButton(
+                            onPressed: _handleSmsLogin,
+                            style: FilledButton.styleFrom(
+                              minimumSize: const Size.fromHeight(50),
+                            ),
+                            child: const Text("Send Verification Code"),
                           ),
-                          child: const Text("Send Login Link"),
-                        ),
+                        ] else ...[
+                          TextField(
+                            controller: _smsCodeController,
+                            decoration: const InputDecoration(
+                              labelText: "Verification Code",
+                              border: OutlineInputBorder(),
+                              prefixIcon: Icon(Icons.password),
+                            ),
+                          ),
+                          const SizedBox(height: 24),
+                          FilledButton(
+                            onPressed: _handleSmsVerification,
+                            style: FilledButton.styleFrom(
+                              minimumSize: const Size.fromHeight(50),
+                            ),
+                            child: const Text("Verify Code"),
+                          ),
+                        ],
                       ],
                     ),
                   ],