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/widgets/analysis/event_analysis_card.dart

@@ -6,6 +6,7 @@ import '../../services/currency_util.dart';
 import '../../theme/app_colors.dart';
 import '../glassmorphism_card.dart';
 import '../themed_text.dart';
+import '../../l10n/app_localizations.dart';
 
 /// 이벤트 할인 현황을 보여주는 카드 위젯
 class EventAnalysisCard extends StatelessWidget {
@@ -50,7 +51,7 @@ class EventAnalysisCard extends StatelessWidget {
                                 mainAxisAlignment: MainAxisAlignment.spaceBetween,
                                 children: [
                                   ThemedText.headline(
-                                    text: '이벤트 할인 현황',
+                                    text: AppLocalizations.of(context).eventDiscountStatus,
                                     style: const TextStyle(
                                       fontSize: 18,
                                     ),
@@ -78,7 +79,7 @@ class EventAnalysisCard extends StatelessWidget {
                                         ),
                                         const SizedBox(width: 4),
                                         Text(
-                                          '${provider.activeEventSubscriptions.length}개 진행중',
+                                          AppLocalizations.of(context).servicesInProgress(provider.activeEventSubscriptions.length),
                                           style: const TextStyle(
                                             fontSize: 12,
                                             fontWeight: FontWeight.bold,
@@ -119,9 +120,9 @@ class EventAnalysisCard extends StatelessWidget {
                                       child: Column(
                                         crossAxisAlignment: CrossAxisAlignment.start,
                                         children: [
-                                          const ThemedText(
-                                            '월간 절약 금액',
-                                            style: TextStyle(
+                                          ThemedText(
+                                            AppLocalizations.of(context).monthlySavingAmount,
+                                            style: const TextStyle(
                                               fontSize: 12,
                                               fontWeight: FontWeight.w500,
                                             ),
@@ -144,9 +145,9 @@ class EventAnalysisCard extends StatelessWidget {
                                 ),
                               ),
                               const SizedBox(height: 16),
-                              const ThemedText(
-                                '진행중인 이벤트',
-                                style: TextStyle(
+                              ThemedText(
+                                AppLocalizations.of(context).eventsInProgress,
+                                style: const TextStyle(
                                   fontSize: 14,
                                   fontWeight: FontWeight.bold,
                                 ),
@@ -246,7 +247,7 @@ class EventAnalysisCard extends StatelessWidget {
                                           borderRadius: BorderRadius.circular(4),
                                         ),
                                         child: Text(
-                                          '$discountRate% 할인',
+                                          '$discountRate${AppLocalizations.of(context).discountPercent}',
                                           style: const TextStyle(
                                             fontSize: 12,
                                             fontWeight: FontWeight.bold,