feat(i18n): 다국어 번역 확장 및 UI 개선

- 영어/일본어/한국어/중국어 번역 추가
- VictoryOverlay 레이아웃 개선
- NewCharacterScreen 기능 추가

lib/l10n/app_localizations_en.dart

@@ -241,4 +241,54 @@ class L10nEn extends L10n {
 
   @override
   String get soldButton => 'Sold!';
+
+  @override
+  String get endingCongratulations => '★ CONGRATULATIONS ★';
+
+  @override
+  String get endingGameComplete => 'You have completed the game!';
+
+  @override
+  String get endingTheHero => 'THE HERO';
+
+  @override
+  String endingLevelFormat(int level) {
+    return 'Level $level';
+  }
+
+  @override
+  String get endingJourneyStats => 'JOURNEY STATISTICS';
+
+  @override
+  String get endingMonstersSlain => 'Monsters Slain';
+
+  @override
+  String get endingQuestsCompleted => 'Quests Completed';
+
+  @override
+  String get endingPlayTime => 'Play Time';
+
+  @override
+  String get endingFinalStats => 'FINAL STATS';
+
+  @override
+  String get endingCredits => 'CREDITS';
+
+  @override
+  String get endingThankYou => 'Thank you for playing!';
+
+  @override
+  String get endingLegendLivesOn => 'Your legend lives on...';
+
+  @override
+  String get endingHallOfFameLine1 => 'Your heroic deeds will be';
+
+  @override
+  String get endingHallOfFameLine2 => 'remembered in the Hall of Fame';
+
+  @override
+  String get endingSkip => 'SKIP';
+
+  @override
+  String get endingTapToSkip => 'TAP TO SKIP';
 }