修复工作人员作业预检状态与提示

apps/service_app/lib/domain/models/service_models.dart

@@ -35,6 +35,12 @@ class PreflightResult {
   final bool canWork;
   final Map<String, Object?> checks;
 
+  /// 仅统计真正阻止进入工作台的检查项。
+  int get blockerCount => checks.values.where((value) {
+    final detail = _map(value);
+    return detail['status'] == 'blocked';
+  }).length;
+
   factory PreflightResult.fromJson(Map<String, Object?> json) => PreflightResult(
     roleCode: json['role_code'] as String? ?? '',
     workStatus: json['work_status'] as String? ?? 'off_duty',