i18n 대대적 변경

userfront/lib/i18n.dart

@@ -0,0 +1,40 @@
+import 'dart:ui';
+
+import 'i18n_data.dart';
+
+const _defaultLocale = 'ko';
+const _supportedLocales = ['ko', 'en'];
+
+String _resolveLocale() {
+  final locale = PlatformDispatcher.instance.locale;
+  final code = locale.languageCode.toLowerCase();
+  if (_supportedLocales.contains(code)) {
+    return code;
+  }
+  return _defaultLocale;
+}
+
+String _formatTemplate(String template, Map<String, String>? params) {
+  if (params == null || params.isEmpty) {
+    return template;
+  }
+  var result = template;
+  params.forEach((key, value) {
+    result = result.replaceAll('{{$key}}', value);
+  });
+  return result;
+}
+
+String tr(
+  String key, {
+  String? fallback,
+  Map<String, String>? params,
+}) {
+  final locale = _resolveLocale();
+  final map = locale == 'en' ? enStrings : koStrings;
+  final value = map[key];
+  final template = (value != null && value.isNotEmpty)
+      ? value
+      : (fallback ?? key);
+  return _formatTemplate(template, params);
+}