feat(i18n): 다국어 번역 확장 및 UI 개선

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

lib/l10n/app_en.arb

@@ -251,5 +251,58 @@
   "@newCharacterTitle": { "description": "New character screen title" },
 
   "soldButton": "Sold!",
-  "@soldButton": { "description": "Confirm character creation button" }
+  "@soldButton": { "description": "Confirm character creation button" },
+
+  "endingCongratulations": "★ CONGRATULATIONS ★",
+  "@endingCongratulations": { "description": "Victory overlay congratulations" },
+
+  "endingGameComplete": "You have completed the game!",
+  "@endingGameComplete": { "description": "Game completion message" },
+
+  "endingTheHero": "THE HERO",
+  "@endingTheHero": { "description": "Hero section title" },
+
+  "endingLevelFormat": "Level {level}",
+  "@endingLevelFormat": {
+    "description": "Level display format",
+    "placeholders": {
+      "level": { "type": "int" }
+    }
+  },
+
+  "endingJourneyStats": "JOURNEY STATISTICS",
+  "@endingJourneyStats": { "description": "Journey statistics section title" },
+
+  "endingMonstersSlain": "Monsters Slain",
+  "@endingMonstersSlain": { "description": "Monsters killed stat label" },
+
+  "endingQuestsCompleted": "Quests Completed",
+  "@endingQuestsCompleted": { "description": "Quests completed stat label" },
+
+  "endingPlayTime": "Play Time",
+  "@endingPlayTime": { "description": "Play time stat label" },
+
+  "endingFinalStats": "FINAL STATS",
+  "@endingFinalStats": { "description": "Final stats section title" },
+
+  "endingCredits": "CREDITS",
+  "@endingCredits": { "description": "Credits section title" },
+
+  "endingThankYou": "Thank you for playing!",
+  "@endingThankYou": { "description": "Thank you message" },
+
+  "endingLegendLivesOn": "Your legend lives on...",
+  "@endingLegendLivesOn": { "description": "Legend message" },
+
+  "endingHallOfFameLine1": "Your heroic deeds will be",
+  "@endingHallOfFameLine1": { "description": "Hall of fame message line 1" },
+
+  "endingHallOfFameLine2": "remembered in the Hall of Fame",
+  "@endingHallOfFameLine2": { "description": "Hall of fame message line 2" },
+
+  "endingSkip": "SKIP",
+  "@endingSkip": { "description": "Skip button" },
+
+  "endingTapToSkip": "TAP TO SKIP",
+  "@endingTapToSkip": { "description": "Tap to skip hint" }
 }