feat(l10n): 게임 텍스트 다국어 지원 확장

- game_text_l10n.dart: 스탯/UI 텍스트 추가 (+61 라인)
- 한국어/일본어 번역 업데이트
- game_data_l10n.dart: 텍스트 접근자 추가
- equipment_stats_panel: l10n 적용 및 레이아웃 개선
- active_buff_panel, potion_inventory_panel: 코드 정리
- new_character_screen: 코드 정리
- progress_service: 마이너 개선

lib/src/features/game/widgets/equipment_stats_panel.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 
 import 'package:askiineverdie/data/game_text_l10n.dart' as l10n;
 import 'package:askiineverdie/src/core/engine/item_service.dart';
+import 'package:askiineverdie/src/core/l10n/game_data_l10n.dart';
 import 'package:askiineverdie/src/core/model/equipment_item.dart';
 import 'package:askiineverdie/src/core/model/equipment_slot.dart';
 import 'package:askiineverdie/src/core/model/game_state.dart';
@@ -80,6 +81,12 @@ class _EquipmentSlotTile extends StatelessWidget {
 
     final score = ItemService.calculateEquipmentScore(item);
     final rarityColor = _getRarityColor(item.rarity);
+    // 슬롯 인덱스로 아이템 이름 번역 (0: weapon, 1: shield, 2+: armor)
+    final translatedName = GameDataL10n.translateEquipString(
+      context,
+      item.name,
+      item.slot.index,
+    );
 
     return ExpansionTile(
       initiallyExpanded: initiallyExpanded,
@@ -92,7 +99,7 @@ class _EquipmentSlotTile extends StatelessWidget {
           const SizedBox(width: 4),
           Expanded(
             child: Text(
-              item.name,
+              translatedName,
               style: TextStyle(
                 fontSize: 11,
                 color: rarityColor,
@@ -426,7 +433,7 @@ class _ItemMetaRow extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final rarityName = item.rarity.name.toUpperCase();
+    final rarityName = _getTranslatedRarity(item.rarity);
 
     return Row(
       children: [
@@ -479,3 +486,14 @@ String _getSlotName(EquipmentSlot slot) {
     EquipmentSlot.sollerets => l10n.slotSollerets,
   };
 }
+
+/// 희귀도 번역 반환
+String _getTranslatedRarity(ItemRarity rarity) {
+  return switch (rarity) {
+    ItemRarity.common => l10n.rarityCommon,
+    ItemRarity.uncommon => l10n.rarityUncommon,
+    ItemRarity.rare => l10n.rarityRare,
+    ItemRarity.epic => l10n.rarityEpic,
+    ItemRarity.legendary => l10n.rarityLegendary,
+  };
+}