feat(l10n): 다국어 문자열 추가

- 옵션 메뉴, 통계, 도움말 등 UI 문자열 추가
- en, ko, ja, zh 지원

lib/l10n/app_localizations_en.dart

@@ -297,4 +297,165 @@ class L10nEn extends L10n {
 
   @override
   String get endingHoldToSpeedUp => 'HOLD TO SPEED UP';
+
+  @override
+  String get menuTitle => 'MENU';
+
+  @override
+  String get optionsTitle => 'OPTIONS';
+
+  @override
+  String get soundTitle => 'SOUND';
+
+  @override
+  String get controlSection => 'CONTROL';
+
+  @override
+  String get infoSection => 'INFO';
+
+  @override
+  String get settingsSection => 'SETTINGS';
+
+  @override
+  String get saveExitSection => 'SAVE / EXIT';
+
+  @override
+  String get ok => 'OK';
+
+  @override
+  String get rechargeButton => 'RECHARGE';
+
+  @override
+  String get createButton => 'CREATE';
+
+  @override
+  String get previewTitle => 'PREVIEW';
+
+  @override
+  String get nameTitle => 'NAME';
+
+  @override
+  String get statsTitle => 'STATS';
+
+  @override
+  String get raceTitle => 'RACE';
+
+  @override
+  String get classSection => 'CLASS';
+
+  @override
+  String get bgmLabel => 'BGM';
+
+  @override
+  String get sfxLabel => 'SFX';
+
+  @override
+  String get hpLabel => 'HP';
+
+  @override
+  String get mpLabel => 'MP';
+
+  @override
+  String get expLabel => 'EXP';
+
+  @override
+  String get notifyLevelUp => 'LEVEL UP!';
+
+  @override
+  String notifyLevel(int level) {
+    return 'Level $level';
+  }
+
+  @override
+  String get notifyQuestComplete => 'QUEST COMPLETE!';
+
+  @override
+  String get notifyPrologueComplete => 'PROLOGUE COMPLETE!';
+
+  @override
+  String notifyActComplete(int number) {
+    return 'ACT $number COMPLETE!';
+  }
+
+  @override
+  String get notifyNewSpell => 'NEW SPELL!';
+
+  @override
+  String get notifyNewEquipment => 'NEW EQUIPMENT!';
+
+  @override
+  String get notifyBossDefeated => 'BOSS DEFEATED!';
+
+  @override
+  String get rechargeRollsTitle => 'RECHARGE ROLLS';
+
+  @override
+  String get rechargeRollsFree => 'Recharge 5 rolls for free?';
+
+  @override
+  String get rechargeRollsAd => 'Watch an ad to recharge 5 rolls?';
+
+  @override
+  String get debugTitle => 'DEBUG';
+
+  @override
+  String get debugCheatsTitle => 'DEBUG CHEATS';
+
+  @override
+  String get debugToolsTitle => 'DEBUG TOOLS';
+
+  @override
+  String get debugDeveloperTools => 'DEVELOPER TOOLS';
+
+  @override
+  String get debugSkipTask => 'SKIP TASK (L+1)';
+
+  @override
+  String get debugSkipTaskDesc => 'Complete task instantly';
+
+  @override
+  String get debugSkipQuest => 'SKIP QUEST (Q!)';
+
+  @override
+  String get debugSkipQuestDesc => 'Complete quest instantly';
+
+  @override
+  String get debugSkipAct => 'SKIP ACT (P!)';
+
+  @override
+  String get debugSkipActDesc => 'Complete act instantly';
+
+  @override
+  String get debugCreateTestCharacter => 'CREATE TEST CHARACTER';
+
+  @override
+  String get debugCreateTestCharacterDesc =>
+      'Register Level 100 character to Hall of Fame';
+
+  @override
+  String get debugCreateTestCharacterTitle => 'CREATE TEST CHARACTER?';
+
+  @override
+  String get debugCreateTestCharacterMessage =>
+      'Current character will be converted to Level 100\nand registered to the Hall of Fame.\n\n⚠️ Current save file will be deleted.\nThis action cannot be undone.';
+
+  @override
+  String get debugTurbo => 'DEBUG: TURBO (20x)';
+
+  @override
+  String get debugIapPurchased => 'IAP PURCHASED';
+
+  @override
+  String get debugIapPurchasedDesc => 'ON: Behave as paid user (ads removed)';
+
+  @override
+  String get debugOfflineHours => 'OFFLINE HOURS';
+
+  @override
+  String get debugOfflineHoursDesc =>
+      'Test return rewards (applies on restart)';
+
+  @override
+  String get debugTestCharacterDesc =>
+      'Modify current character to Level 100\nand register to the Hall of Fame.';
 }