refactor(l10n): 골드를 코인으로 명칭 변경

- gold → coin으로 용어 통일
- 사망 오버레이 레이블 수정

lib/l10n/app_en.arb

@@ -171,12 +171,12 @@
   "equipSollerets": "Sollerets",
   "@equipSollerets": { "description": "Sollerets equipment slot" },
 
-  "gold": "Gold",
-  "@gold": { "description": "Gold label" },
+  "gold": "Coin",
+  "@gold": { "description": "Coin label" },
 
-  "goldAmount": "Gold: {amount}",
+  "goldAmount": "Coin: {amount}",
   "@goldAmount": {
-    "description": "Gold with amount",
+    "description": "Coin with amount",
     "placeholders": {
       "amount": { "type": "int" }
     }

lib/l10n/app_ja.arb

@@ -56,8 +56,8 @@
   "equipCuisses": "Cuisses",
   "equipGreaves": "Greaves",
   "equipSollerets": "Sollerets",
-  "gold": "Gold",
-  "goldAmount": "Gold: {amount}",
+  "gold": "コイン",
+  "goldAmount": "コイン: {amount}",
   "prologue": "Prologue",
   "actNumber": "Act {number}",
   "noActiveQuests": "No active quests",

lib/l10n/app_ko.arb

@@ -56,8 +56,8 @@
   "equipCuisses": "허벅지보호대",
   "equipGreaves": "정강이보호대",
   "equipSollerets": "철제 신발",
-  "gold": "골드",
-  "goldAmount": "골드: {amount}",
+  "gold": "코인",
+  "goldAmount": "코인: {amount}",
   "prologue": "프롤로그",
   "actNumber": "{number}막",
   "noActiveQuests": "진행 중인 퀘스트 없음",

lib/l10n/app_localizations.dart

@@ -431,16 +431,16 @@ abstract class L10n {
   /// **'Sollerets'**
   String get equipSollerets;
 
-  /// Gold label
+  /// Coin label
   ///
   /// In en, this message translates to:
-  /// **'Gold'**
+  /// **'Coin'**
   String get gold;
 
-  /// Gold with amount
+  /// Coin with amount
   ///
   /// In en, this message translates to:
-  /// **'Gold: {amount}'**
+  /// **'Coin: {amount}'**
   String goldAmount(int amount);
 
   /// Prologue plot stage

lib/l10n/app_localizations_en.dart

@@ -176,11 +176,11 @@ class L10nEn extends L10n {
   String get equipSollerets => 'Sollerets';
 
   @override
-  String get gold => 'Gold';
+  String get gold => 'Coin';
 
   @override
   String goldAmount(int amount) {
-    return 'Gold: $amount';
+    return 'Coin: $amount';
   }
 
   @override

lib/l10n/app_localizations_ja.dart

@@ -176,11 +176,11 @@ class L10nJa extends L10n {
   String get equipSollerets => 'Sollerets';
 
   @override
-  String get gold => 'Gold';
+  String get gold => 'コイン';
 
   @override
   String goldAmount(int amount) {
-    return 'Gold: $amount';
+    return 'コイン: $amount';
   }
 
   @override

lib/l10n/app_localizations_ko.dart

@@ -176,11 +176,11 @@ class L10nKo extends L10n {
   String get equipSollerets => '철제 신발';
 
   @override
-  String get gold => '골드';
+  String get gold => '코인';
 
   @override
   String goldAmount(int amount) {
-    return '골드: $amount';
+    return '코인: $amount';
   }
 
   @override

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

@@ -245,7 +245,7 @@ class DeathOverlay extends StatelessWidget {
         _buildInfoRow(
           context,
           icon: Icons.monetization_on_outlined,
-          label: l10n.deathGoldRemaining,
+          label: l10n.deathCoinRemaining,
           value: _formatGold(deathInfo.goldAtDeath),
           isNegative: false,
         ),