feat(core): i18n 및 핵심 로직 개선

- 수익화 관련 텍스트 추가
- item_service 수정
- progress_service 수정

lib/data/game_text_l10n.dart

@@ -141,14 +141,56 @@ String get deathNoSacrificeNeeded =>
     _l('No sacrifice needed', '희생 없이 부활', '犠牲なしで復活');
 String get deathCoinRemaining => _l('Coin Remaining', '남은 코인', '残りコイン');
 String get deathResurrect => _l('Resurrect', '부활', '復活');
-String get deathAutoResurrect => _l('Auto Resurrect', '자동 부활', '自動復活');
 String get deathCombatLog => _l('Combat Log', '전투 기록', '戦闘ログ');
 
+// 광고 부활 (통합)
+String get deathAdRevive => _l('Watch Ad & Revive', '광고보고 부활', '広告視聴で復活');
+String get deathAdReviveHp => _l('HP 100% Recovery', 'HP 100% 회복', 'HP 100%回復');
+String get deathAdReviveItem => _l('Item Recovery', '아이템 복구', 'アイテム回収');
+String get deathAdReviveAuto =>
+    _l('10min Auto-Revive Buff', '10분간 자동부활 버프', '10分間自動復活バフ');
+String get deathAdRevivePaidDesc =>
+    _l('Premium: No ads required', '프리미엄: 광고 없이 이용', 'プレミアム: 広告不要');
+
 String deathKilledBy(String killerName) =>
     _l('Killed by $killerName', '$killerName에게 사망', '$killerNameに倒された');
 String get deathEnvironmentalHazard =>
     _l('Environmental hazard', '환경 피해로 사망', '環境ダメージで死亡');
 
+// ============================================================================
+// 속도 부스트 (Phase 6)
+// ============================================================================
+
+String get speedBoostTitle =>
+    _l('Speed Boost', '속도 부스트', 'スピードブースト');
+String get speedBoostActivate =>
+    _l('Activate 10x Speed', '10배속 활성화', '10倍速を有効化');
+String speedBoostRemaining(int seconds) =>
+    _l('${seconds}s remaining', '${seconds}초 남음', '残り${seconds}秒');
+String get speedBoostActive =>
+    _l('BOOST ACTIVE', '부스트 활성화', 'ブースト中');
+
+// ============================================================================
+// 복귀 보상 (Phase 7)
+// ============================================================================
+
+String get returnRewardTitle =>
+    _l('Welcome Back!', '돌아오셨군요!', 'おかえりなさい!');
+String returnRewardHoursAway(String time) =>
+    _l('You were away for $time', '$time 동안 떠나있었습니다', '$time 離れていました');
+String get returnRewardBasic =>
+    _l('Basic Reward', '기본 보상', '基本報酬');
+String get returnRewardBonus =>
+    _l('Bonus Reward', '보너스 보상', 'ボーナス報酬');
+String returnRewardGold(int gold) =>
+    _l('+$gold Gold', '+$gold 골드', '+$gold ゴールド');
+String get returnRewardClaim =>
+    _l('Claim', '받기', '受け取る');
+String get returnRewardClaimBonus =>
+    _l('Claim Bonus', '보너스 받기', 'ボーナス受取');
+String get returnRewardSkip =>
+    _l('Skip', '건너뛰기', 'スキップ');
+
 // ============================================================================
 // UI 일반 메시지
 // ============================================================================