feat(app): 오디오 및 설정 시스템 통합

- AudioService 앱 수준 초기화 및 dispose
- 게임 화면에서 오디오/설정 연동

lib/src/features/game/game_play_screen.dart

@@ -31,6 +31,8 @@ import 'package:askiineverdie/src/features/game/widgets/potion_inventory_panel.d
 import 'package:askiineverdie/src/features/game/widgets/task_progress_panel.dart';
 import 'package:askiineverdie/src/features/game/widgets/active_buff_panel.dart';
 import 'package:askiineverdie/src/features/game/layouts/mobile_carousel_layout.dart';
+import 'package:askiineverdie/src/features/settings/settings_screen.dart';
+import 'package:askiineverdie/src/core/storage/settings_repository.dart';
 
 /// 게임 진행 화면 (Main.dfm 기반 3패널 레이아웃)
 ///
@@ -463,51 +465,17 @@ class _GamePlayScreenState extends State<GamePlayScreen>
     return platform == TargetPlatform.iOS || platform == TargetPlatform.android;
   }
 
-  /// 현재 언어명 가져오기
-  String _getCurrentLanguageName() {
-    final locale = game_l10n.currentGameLocale;
-    if (locale == 'ko') return game_l10n.languageKorean;
-    if (locale == 'ja') return game_l10n.languageJapanese;
-    return game_l10n.languageEnglish;
-  }
-
-  /// 언어 선택 다이얼로그 표시
-  void _showLanguageDialog(BuildContext context) {
-    showDialog<void>(
-      context: context,
-      builder: (context) => AlertDialog(
-        title: Text(game_l10n.menuLanguage),
-        content: Column(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            _buildLanguageOption(context, 'en', game_l10n.languageEnglish),
-            _buildLanguageOption(context, 'ko', game_l10n.languageKorean),
-            _buildLanguageOption(context, 'ja', game_l10n.languageJapanese),
-          ],
-        ),
-      ),
-    );
-  }
-
-  Widget _buildLanguageOption(
-    BuildContext context,
-    String locale,
-    String label,
-  ) {
-    final isSelected = game_l10n.currentGameLocale == locale;
-    return ListTile(
-      leading: Icon(
-        isSelected ? Icons.radio_button_checked : Icons.radio_button_unchecked,
-        color: isSelected ? Theme.of(context).colorScheme.primary : null,
-      ),
-      title: Text(
-        label,
-        style: TextStyle(
-          fontWeight: isSelected ? FontWeight.bold : FontWeight.normal,
-        ),
-      ),
-      onTap: () async {
-        Navigator.pop(context); // 다이얼로그 닫기
+  /// 설정 화면 표시
+  void _showSettingsScreen(BuildContext context) {
+    final settingsRepo = SettingsRepository();
+    SettingsScreen.show(
+      context,
+      settingsRepository: settingsRepo,
+      currentThemeMode: widget.currentThemeMode,
+      onThemeModeChange: (mode) {
+        widget.onThemeModeChange?.call(mode);
+      },
+      onLocaleChange: (locale) async {
         // 안전한 언어 변경: 전체 화면 재생성
         final navigator = Navigator.of(this.context);
         await widget.controller.pause(saveOnStop: true);
@@ -698,11 +666,11 @@ class _GamePlayScreenState extends State<GamePlayScreen>
                   onPressed: () => widget.controller.loop?.cheatCompletePlot(),
                 ),
               ],
-              // 언어 변경 버튼
-              TextButton.icon(
-                onPressed: () => _showLanguageDialog(context),
-                icon: const Icon(Icons.language, size: 18),
-                label: Text(_getCurrentLanguageName()),
+              // 설정 버튼
+              IconButton(
+                icon: const Icon(Icons.settings),
+                tooltip: game_l10n.uiSettings,
+                onPressed: () => _showSettingsScreen(context),
               ),
             ],
           ),