feat: 다국어 지원 및 다중 통화 환율 변환 기능 확대

- ExchangeRateService에 JPY, CNY 환율 지원 추가
- 구독 서비스별 다국어 표시 이름 지원
- 분석 화면 차트 및 UI/UX 개선
- 설정 화면 전면 리팩토링
- SMS 스캔 기능 사용성 개선
- 전체 앱 다국어 번역 확대

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

lib/screens/sms_scan_screen.dart

@@ -2,10 +2,12 @@ import 'package:flutter/material.dart';
 import '../services/sms_scanner.dart';
 import '../providers/subscription_provider.dart';
 import '../providers/navigation_provider.dart';
+import '../providers/locale_provider.dart';
 import 'package:provider/provider.dart';
 import '../models/subscription.dart';
 import '../models/subscription_model.dart';
 import '../services/subscription_url_matcher.dart';
+import '../services/currency_util.dart';
 import 'package:intl/intl.dart'; // NumberFormat을 사용하기 위한 import 추가
 import '../widgets/glassmorphism_card.dart';
 import '../widgets/themed_text.dart';
@@ -18,6 +20,7 @@ import '../providers/category_provider.dart';
 import '../models/category_model.dart';
 import '../widgets/common/form_fields/category_selector.dart';
 import '../widgets/native_ad_widget.dart';
+import '../l10n/app_localizations.dart';
 
 class SmsScanScreen extends StatefulWidget {
   const SmsScanScreen({super.key});
@@ -75,7 +78,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
       if (scannedSubscriptionModels.isEmpty) {
         print('스캔된 구독이 없음');
         setState(() {
-          _errorMessage = '구독 정보를 찾을 수 없습니다.';
+          _errorMessage = AppLocalizations.of(context).subscriptionNotFound;
           _isLoading = false;
         });
         return;
@@ -98,7 +101,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
       if (repeatSubscriptions.isEmpty) {
         print('반복 결제된 구독이 없음');
         setState(() {
-          _errorMessage = '반복 결제된 구독 정보를 찾을 수 없습니다.';
+          _errorMessage = AppLocalizations.of(context).repeatSubscriptionNotFound;
           _isLoading = false;
         });
         return;
@@ -131,7 +134,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
         if (mounted) {
           AppSnackBar.showInfo(
             context: context,
-            message: '신규 구독 관련 SMS를 찾을 수 없습니다',
+            message: AppLocalizations.of(context).newSubscriptionNotFound,
             icon: Icons.search_off_rounded,
           );
         }
@@ -148,7 +151,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
       print('SMS 스캔 중 오류 발생: $e');
       if (mounted) {
         setState(() {
-          _errorMessage = 'SMS 스캔 중 오류가 발생했습니다: $e';
+          _errorMessage = AppLocalizations.of(context).smsScanErrorWithMessage(e.toString());
           _isLoading = false;
         });
       }
@@ -389,7 +392,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
       if (mounted) {
         AppSnackBar.showSuccess(
           context: context,
-          message: '${subscription.serviceName} 구독이 추가되었습니다.',
+          message: AppLocalizations.of(context).subscriptionAddedWithName(subscription.serviceName),
         );
       }
 
@@ -400,7 +403,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
       if (mounted) {
         AppSnackBar.showError(
           context: context,
-          message: '구독 추가 중 오류가 발생했습니다: $e',
+          message: AppLocalizations.of(context).subscriptionAddErrorWithMessage(e.toString()),
         );
 
         // 오류가 있어도 다음 구독으로 이동
@@ -416,7 +419,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
     if (mounted) {
       AppSnackBar.showInfo(
         context: context,
-        message: '${subscription.serviceName} 구독을 건너뛰었습니다.',
+        message: AppLocalizations.of(context).subscriptionSkipped(subscription.serviceName),
         icon: Icons.skip_next_rounded,
       );
     }
@@ -447,7 +450,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
     // 완료 메시지 표시
     AppSnackBar.showSuccess(
       context: context,
-      message: '모든 구독이 처리되었습니다.',
+      message: AppLocalizations.of(context).allSubscriptionsProcessed,
     );
   }
 
@@ -482,7 +485,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
         }
 
         final daysUntil = adjusted.difference(now).inDays;
-        return '다음 예상 결제일: ${_formatDate(adjusted)} ($daysUntil일 후)';
+        return AppLocalizations.of(context).nextBillingDateEstimated(AppLocalizations.of(context).formatDate(adjusted), daysUntil);
       } else if (subscription.billingCycle == '연간') {
         // 올해 또는 내년 같은 날짜
         int day = date.day;
@@ -503,14 +506,14 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
         }
 
         final daysUntil = adjusted.difference(now).inDays;
-        return '다음 예상 결제일: ${_formatDate(adjusted)} ($daysUntil일 후)';
+        return AppLocalizations.of(context).nextBillingDateEstimated(AppLocalizations.of(context).formatDate(adjusted), daysUntil);
       } else {
         return '다음 결제일 확인 필요 (과거 날짜)';
       }
     } else {
       // 미래 날짜인 경우
       final daysUntil = date.difference(now).inDays;
-      return '다음 결제일: ${_formatDate(date)} ($daysUntil일 후)';
+      return AppLocalizations.of(context).nextBillingDateInfo(AppLocalizations.of(context).formatDate(date), daysUntil);
     }
   }
 
@@ -521,7 +524,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
 
   // 결제 반복 횟수 텍스트
   String _getRepeatCountText(int count) {
-    return '$count회 결제 감지됨';
+    return AppLocalizations.of(context).repeatCountDetected(count);
   }
 
   // 카테고리 칩 빌드
@@ -532,7 +535,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
     
     // 카테고리가 없으면 기타 카테고리 찾기
     final defaultCategory = category ?? categoryProvider.categories.firstWhere(
-      (cat) => cat.name == '기타',
+      (cat) => cat.name == 'other',
       orElse: () => categoryProvider.categories.first,
     );
 
@@ -553,7 +556,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
           ),
           const SizedBox(width: 6),
           ThemedText(
-            defaultCategory.name,
+            categoryProvider.getLocalizedCategoryName(context, defaultCategory.name),
             fontSize: 14,
             fontWeight: FontWeight.w500,
             forceDark: true,
@@ -567,25 +570,25 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
   // 카테고리 아이콘 반환
   IconData _getCategoryIcon(CategoryModel category) {
     switch (category.name) {
-      case '음악':
+      case 'music':
         return Icons.music_note_rounded;
-      case 'OTT(동영상)':
+      case 'ottVideo':
         return Icons.movie_filter_rounded;
-      case '저장/클라우드':
+      case 'storageCloud':
         return Icons.cloud_outlined;
-      case '통신 · 인터넷 · TV':
+      case 'telecomInternetTv':
         return Icons.wifi_rounded;
-      case '생활/라이프스타일':
+      case 'lifestyle':
         return Icons.home_outlined;
-      case '쇼핑/이커머스':
+      case 'shoppingEcommerce':
         return Icons.shopping_cart_outlined;
-      case '프로그래밍':
+      case 'programming':
         return Icons.code_rounded;
-      case '협업/오피스':
+      case 'collaborationOffice':
         return Icons.business_center_outlined;
-      case 'AI 서비스':
+      case 'aiService':
         return Icons.smart_toy_outlined;
-      case '기타':
+      case 'other':
       default:
         return Icons.category_outlined;
     }
@@ -595,7 +598,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
   String _getDefaultCategoryId() {
     final categoryProvider = Provider.of<CategoryProvider>(context, listen: false);
     final otherCategory = categoryProvider.categories.firstWhere(
-      (cat) => cat.name == '기타',
+      (cat) => cat.name == 'other',
       orElse: () => categoryProvider.categories.first, // 만약 "기타"가 없으면 첫 번째 카테고리
     );
     print('기본 카테고리 설정: ${otherCategory.name} (ID: ${otherCategory.id})');
@@ -638,9 +641,9 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
               valueColor: AlwaysStoppedAnimation<Color>(AppColors.primaryColor),
             ),
             const SizedBox(height: 16),
-            const ThemedText('SMS 메시지를 스캔 중입니다...', forceDark: true),
+            ThemedText(AppLocalizations.of(context).scanningMessages, forceDark: true),
             const SizedBox(height: 8),
-            const ThemedText('구독 서비스를 찾고 있습니다', opacity: 0.7, forceDark: true),
+            ThemedText(AppLocalizations.of(context).findingSubscriptions, opacity: 0.7, forceDark: true),
           ],
         ),
       ),
@@ -668,17 +671,17 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
                     textAlign: TextAlign.center,
                   ),
                 ),
-              const ThemedText(
-                '2회 이상 결제된 구독 서비스 찾기',
+              ThemedText(
+                AppLocalizations.of(context).findRepeatSubscriptions,
                 fontSize: 20,
                 fontWeight: FontWeight.bold,
                 forceDark: true,
               ),
               const SizedBox(height: 16),
-              const Padding(
-                padding: EdgeInsets.symmetric(horizontal: 16.0),
+              Padding(
+                padding: const EdgeInsets.symmetric(horizontal: 16.0),
                 child: ThemedText(
-                  '문자 메시지를 스캔하여 반복적으로 결제된 구독 서비스를 자동으로 찾습니다. 서비스명과 금액을 추출하여 쉽게 구독을 추가할 수 있습니다.',
+                  AppLocalizations.of(context).scanTextMessages,
                   textAlign: TextAlign.center,
                   opacity: 0.7,
                   forceDark: true,
@@ -686,7 +689,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
               ),
               const SizedBox(height: 32),
               PrimaryButton(
-                text: '스캔 시작하기',
+                text: AppLocalizations.of(context).startScanning,
                 icon: Icons.search_rounded,
                 onPressed: _scanSms,
                 width: 200,
@@ -751,16 +754,16 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.start,
               children: [
-                const ThemedText(
-                  '다음 구독을 찾았습니다',
+                ThemedText(
+                  AppLocalizations.of(context).foundSubscription,
                   fontSize: 18,
                   fontWeight: FontWeight.bold,
                   forceDark: true,
                 ),
                 const SizedBox(height: 24),
                 // 서비스명
-                const ThemedText(
-                  '서비스명',
+                ThemedText(
+                  AppLocalizations.of(context).serviceName,
                   fontWeight: FontWeight.w500,
                   opacity: 0.7,
                   forceDark: true,
@@ -781,28 +784,28 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
                       child: Column(
                         crossAxisAlignment: CrossAxisAlignment.start,
                         children: [
-                          const ThemedText(
-                            '월 비용',
+                          ThemedText(
+                            AppLocalizations.of(context).monthlyCost,
                             fontWeight: FontWeight.w500,
                             opacity: 0.7,
                             forceDark: true,
                           ),
                           const SizedBox(height: 4),
-                          ThemedText(
-                            subscription.currency == 'USD'
-                                ? NumberFormat.currency(
-                                    locale: 'en_US',
-                                    symbol: '\$',
-                                    decimalDigits: 2,
-                                  ).format(subscription.monthlyCost)
-                                : NumberFormat.currency(
-                                    locale: 'ko_KR',
-                                    symbol: '₩',
-                                    decimalDigits: 0,
-                                  ).format(subscription.monthlyCost),
-                            fontSize: 18,
-                            fontWeight: FontWeight.bold,
-                            forceDark: true,
+                          // 언어별 통화 표시
+                          FutureBuilder<String>(
+                            future: CurrencyUtil.formatAmountWithLocale(
+                              subscription.monthlyCost,
+                              subscription.currency,
+                              context.read<LocaleProvider>().locale.languageCode,
+                            ),
+                            builder: (context, snapshot) {
+                              return ThemedText(
+                                snapshot.data ?? '-',
+                                fontSize: 18,
+                                fontWeight: FontWeight.bold,
+                                forceDark: true,
+                              );
+                            },
                           ),
                         ],
                       ),
@@ -811,8 +814,8 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
                       child: Column(
                         crossAxisAlignment: CrossAxisAlignment.start,
                         children: [
-                          const ThemedText(
-                            '결제 주기',
+                          ThemedText(
+                            AppLocalizations.of(context).billingCycle,
                             fontWeight: FontWeight.w500,
                             opacity: 0.7,
                             forceDark: true,
@@ -832,8 +835,8 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
                 const SizedBox(height: 16),
 
                 // 다음 결제일
-                const ThemedText(
-                  '다음 결제일',
+                ThemedText(
+                  AppLocalizations.of(context).nextBillingDateLabel,
                   fontWeight: FontWeight.w500,
                   opacity: 0.7,
                   forceDark: true,
@@ -848,8 +851,8 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
                 const SizedBox(height: 16),
 
                 // 카테고리 선택
-                const ThemedText(
-                  '카테고리',
+                ThemedText(
+                  AppLocalizations.of(context).category,
                   fontWeight: FontWeight.w500,
                   opacity: 0.7,
                   forceDark: true,
@@ -877,8 +880,8 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
                 // 웹사이트 URL 입력 필드 추가/수정
                 BaseTextField(
                   controller: _websiteUrlController,
-                  label: '웹사이트 URL (자동 추출됨)',
-                  hintText: '웹사이트 URL을 수정하거나 비워두세요',
+                  label: AppLocalizations.of(context).websiteUrlAuto,
+                  hintText: AppLocalizations.of(context).websiteUrlHint,
                   prefixIcon: Icon(
                     Icons.language,
                     color: AppColors.navyGray,
@@ -895,7 +898,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
                   children: [
                     Expanded(
                       child: SecondaryButton(
-                        text: '건너뛰기',
+                        text: AppLocalizations.of(context).skip,
                         onPressed: _skipCurrentSubscription,
                         height: 48,
                       ),
@@ -903,7 +906,7 @@ class _SmsScanScreenState extends State<SmsScanScreen> {
                     const SizedBox(width: 16),
                     Expanded(
                       child: PrimaryButton(
-                        text: '추가하기',
+                        text: AppLocalizations.of(context).add,
                         onPressed: _addCurrentSubscription,
                         height: 48,
                       ),