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/game_play_screen.dart

@@ -174,6 +174,10 @@ class _GamePlayScreenState extends State<GamePlayScreen>
   /// 전투 이벤트를 메시지와 타입으로 변환
   (String, CombatLogType) _formatCombatEvent(CombatEvent event) {
     final target = event.targetName ?? '';
+    // 스킬/포션 이름 번역 (전역 로케일 사용)
+    final skillName = event.skillName != null
+        ? game_l10n.translateSpell(event.skillName!)
+        : '';
     return switch (event.type) {
       CombatEventType.playerAttack =>
         event.isCritical
@@ -208,41 +212,34 @@ class _GamePlayScreenState extends State<GamePlayScreen>
       CombatEventType.playerSkill =>
         event.isCritical
             ? (
-                game_l10n.combatSkillCritical(
-                  event.skillName ?? '',
-                  event.damage,
-                ),
+                game_l10n.combatSkillCritical(skillName, event.damage),
                 CombatLogType.critical,
               )
             : (
-                game_l10n.combatSkillDamage(event.skillName ?? '', event.damage),
+                game_l10n.combatSkillDamage(skillName, event.damage),
                 CombatLogType.spell,
               ),
       CombatEventType.playerHeal => (
         game_l10n.combatSkillHeal(
-          event.skillName ?? game_l10n.uiHeal,
+          skillName.isNotEmpty ? skillName : game_l10n.uiHeal,
           event.healAmount,
         ),
         CombatLogType.heal,
       ),
       CombatEventType.playerBuff => (
-        game_l10n.combatBuffActivated(event.skillName ?? ''),
+        game_l10n.combatBuffActivated(skillName),
         CombatLogType.buff,
       ),
       CombatEventType.dotTick => (
-        game_l10n.combatDotTick(event.skillName ?? '', event.damage),
+        game_l10n.combatDotTick(skillName, event.damage),
         CombatLogType.dotTick,
       ),
       CombatEventType.playerPotion => (
-        game_l10n.combatPotionUsed(
-          event.skillName ?? '',
-          event.healAmount,
-          target,
-        ),
+        game_l10n.combatPotionUsed(skillName, event.healAmount, target),
         CombatLogType.potion,
       ),
       CombatEventType.potionDrop => (
-        game_l10n.combatPotionDrop(event.skillName ?? ''),
+        game_l10n.combatPotionDrop(skillName),
         CombatLogType.potionDrop,
       ),
     };

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

@@ -127,7 +127,7 @@ class _BuffRow extends StatelessWidget {
     if (effect.atkModifier != 0) {
       modifiers.add(
         _ModifierChip(
-          label: 'ATK',
+          label: l10n.statAtk,
           value: effect.atkModifier,
           isPositive: effect.atkModifier > 0,
         ),
@@ -137,7 +137,7 @@ class _BuffRow extends StatelessWidget {
     if (effect.defModifier != 0) {
       modifiers.add(
         _ModifierChip(
-          label: 'DEF',
+          label: l10n.statDef,
           value: effect.defModifier,
           isPositive: effect.defModifier > 0,
         ),
@@ -147,7 +147,7 @@ class _BuffRow extends StatelessWidget {
     if (effect.criRateModifier != 0) {
       modifiers.add(
         _ModifierChip(
-          label: 'CRI',
+          label: l10n.statCri,
           value: effect.criRateModifier,
           isPositive: effect.criRateModifier > 0,
         ),
@@ -157,7 +157,7 @@ class _BuffRow extends StatelessWidget {
     if (effect.evasionModifier != 0) {
       modifiers.add(
         _ModifierChip(
-          label: 'EVA',
+          label: l10n.statEva,
           value: effect.evasionModifier,
           isPositive: effect.evasionModifier > 0,
         ),

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,
+  };
+}

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

@@ -110,10 +110,10 @@ class _PotionRow extends StatelessWidget {
             _PotionIcon(type: potion.type, tier: potion.tier),
             const SizedBox(width: 4),
 
-            // 물약 이름
+            // 물약 이름 (번역 적용)
             Expanded(
               child: Text(
-                potion.name,
+                l10n.translateSpell(potion.name),
                 style: TextStyle(
                   fontSize: 11,
                   color: color,