fix：参考金值，研听，研值工程通用通用工程公共能力，重点对比网络请求、登录认证、状态管理、本地存储、WebView、推送、版本更新、一键登录、主题/UI 等模块，确定后续统一整改方案

lib/common/network/api_exception.dart

@@ -0,0 +1,123 @@
+import 'package:dio/dio.dart';
+
+import '../../models/pb/errors/errors.pb.dart' as kerrors;
+
+enum ApiExceptionKind { transport, http, backend, decode, cancelled }
+
+/// The single network failure shape exposed to application code.
+class ApiException implements Exception {
+  const ApiException({
+    required this.kind,
+    this.httpStatus,
+    this.backendCode,
+    this.reason,
+    this.serverMessage,
+    this.requestOptions,
+    this.cause,
+  });
+
+  final ApiExceptionKind kind;
+  final int? httpStatus;
+  final int? backendCode;
+  final String? reason;
+  final String? serverMessage;
+  final RequestOptions? requestOptions;
+  final Object? cause;
+
+  bool get isUnauthorized =>
+      httpStatus == 401 ||
+      const {'INVALID_TOKEN', 'TOKEN_EXPIRED'}.contains(reason?.toUpperCase());
+
+  bool get isRetryable {
+    if (kind == ApiExceptionKind.transport) return true;
+    final status = httpStatus;
+    return status == 408 || status == 429 || (status != null && status >= 500);
+  }
+
+  int? get sessionGeneration =>
+      requestOptions?.extra[authSessionGenerationExtra] as int?;
+
+  static ApiException from(Object error, {StackTrace? stackTrace}) {
+    if (error is ApiException) return error;
+    if (error is DioException) {
+      if (error.error is ApiException) return error.error! as ApiException;
+      return fromDio(error);
+    }
+    if (error is FormatException) {
+      return ApiException(kind: ApiExceptionKind.decode, cause: error);
+    }
+    return ApiException(kind: ApiExceptionKind.decode, cause: error);
+  }
+
+  static ApiException fromDio(DioException error) {
+    final response = error.response;
+    final status = response?.statusCode;
+    final kratos = parseKratosError(response?.data);
+    if (error.type == DioExceptionType.cancel) {
+      return ApiException(
+        kind: ApiExceptionKind.cancelled,
+        httpStatus: status,
+        requestOptions: error.requestOptions,
+        cause: error,
+      );
+    }
+    final kind = kratos != null
+        ? ApiExceptionKind.backend
+        : status != null
+        ? ApiExceptionKind.http
+        : ApiExceptionKind.transport;
+    return ApiException(
+      kind: kind,
+      httpStatus: status,
+      backendCode: kratos?.code,
+      reason: _normalized(kratos?.reason),
+      serverMessage: _normalized(kratos?.message),
+      requestOptions: error.requestOptions,
+      cause: error,
+    );
+  }
+
+  @override
+  String toString() =>
+      'ApiException($kind, status: $httpStatus, code: $backendCode, '
+      'reason: $reason, message: $serverMessage)';
+}
+
+const authSessionGenerationExtra = 'authSessionGeneration';
+
+kerrors.Status? parseKratosError(Object? raw) {
+  if (raw is List<int> && raw.isNotEmpty) {
+    try {
+      final status = kerrors.Status.fromBuffer(raw);
+      if (status.code != 0 || status.reason.isNotEmpty) return status;
+    } catch (_) {
+      return null;
+    }
+  }
+  if (raw is Map) {
+    final code = raw['code'];
+    final reason = '${raw['reason'] ?? ''}';
+    final message = '${raw['message'] ?? ''}';
+    if (code is num || reason.isNotEmpty || message.isNotEmpty) {
+      return kerrors.Status(
+        code: code is num ? code.toInt() : 0,
+        reason: reason,
+        message: message,
+      );
+    }
+  }
+  return null;
+}
+
+String? _normalized(String? value) {
+  final result = value?.trim() ?? '';
+  return result.isEmpty ? null : result;
+}
+
+class ApiExceptionInterceptor extends Interceptor {
+  @override
+  void onError(DioException err, ErrorInterceptorHandler handler) {
+    final apiException = ApiException.fromDio(err);
+    handler.next(err.copyWith(error: apiException));
+  }
+}