feat：参照研听的基础工程

lib/common/network/api_error_message.dart

@@ -0,0 +1,20 @@
+import 'package:dio/dio.dart';
+
+String? kratosReason(Object e) {
+  if (e is! DioException) return null;
+  final body = e.response?.data;
+  if (body is Map && body['reason'] is String) return body['reason'] as String;
+  return null;
+}
+
+String kratosDisplayMessage(Object e, {required String fallback}) {
+  if (kratosReason(e) == 'INTERNAL_ERROR') return fallback;
+  if (e is DioException) {
+    final body = e.response?.data;
+    if (body is Map && body['message'] is String) {
+      final m = body['message'] as String;
+      if (m.isNotEmpty) return m;
+    }
+  }
+  return fallback;
+}