第一次打开:

App启动 → 设备登录 → 保存Token → 进入主页

  后续打开:
  App启动 → 检测本地Token → Token有效 → 自动登录 → 进入主页
                        ↓
                    Token失效/无效 → 自动设备登录 → 更新Token → 进入主页

lib/app/model/response/kr_package_list.dart

@@ -193,11 +193,16 @@ class KRPackageListItem {
     final descriptionJson = json['description'];
     KRDescription description;
     if (descriptionJson is String) {
-      try {
-        description = KRDescription.fromJson(jsonDecode(descriptionJson));
-      } catch (e) {
-        KRLogUtil.kr_e('解析描述信息失败: $e');
+      // 如果是空字符串，直接返回空描述
+      if (descriptionJson.isEmpty) {
         description = KRDescription(kr_features: []);
+      } else {
+        try {
+          description = KRDescription.fromJson(jsonDecode(descriptionJson));
+        } catch (e) {
+          KRLogUtil.kr_e('解析描述信息失败: $e');
+          description = KRDescription(kr_features: []);
+        }
       }
     } else if (descriptionJson is Map<String, dynamic>) {
       description = KRDescription.fromJson(descriptionJson);