🎨 Use feature based folder structure

lib/core/translate.dart

@@ -0,0 +1,42 @@
+import 'dart:convert';
+
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:island/core/network.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+part 'translate.freezed.dart';
+part 'translate.g.dart';
+
+@freezed
+sealed class TranslateQuery with _$TranslateQuery {
+  const factory TranslateQuery({required String text, required String lang}) =
+      _TranslateQuery;
+}
+
+@riverpod
+Future<String> translateString(Ref ref, TranslateQuery query) async {
+  final client = ref.watch(apiClientProvider);
+  final response = await client.post(
+    '/sphere/translate',
+    queryParameters: {'to': query.lang},
+    data: jsonEncode(query.text),
+  );
+  return response.data as String;
+}
+
+@riverpod
+String? detectStringLanguage(Ref ref, String text) {
+  bool isChinese(String text) {
+    final chineseRegex = RegExp(r'[\u4e00-\u9fff]');
+    return chineseRegex.hasMatch(text);
+  }
+
+  bool isEnglish(String text) {
+    final englishRegex = RegExp(r'[a-zA-Z]');
+    return englishRegex.hasMatch(text) && !isChinese(text);
+  }
+
+  if (isChinese(text)) return "zh";
+  if (isEnglish(text)) return "en";
+  return null;
+}