feat: Add Korean language support and localization files

lib/features/profile/views/app_customization_page.dart

@@ -1669,6 +1669,8 @@ class AppCustomizationPage extends ConsumerWidget {
         return AppLocalizations.of(context)!.russian;
       case 'zh':
         return AppLocalizations.of(context)!.chinese;
+      case 'kr':
+        return AppLocalizations.of(context)!.korean;
       default:
         return AppLocalizations.of(context)!.system;
     }
@@ -1901,6 +1903,11 @@ class AppCustomizationPage extends ConsumerWidget {
                 trailing: current == 'zh' ? const Icon(Icons.check) : null,
                 onTap: () => Navigator.pop(context, 'zh'),
               ),
+              ListTile(
+                title: Text(AppLocalizations.of(context)!.korean),
+                trailing: current == 'kr' ? const Icon(Icons.check) : null,
+                onTap: () => Navigator.pop(context, 'kr'),
+              ),
               const SizedBox(height: Spacing.sm),
             ],
           ),