feat(卡列表): 新增 has_active_package 查询条件筛选生效中套餐

- DTO ListStandaloneIotCardRequest 增加 HasActivePackage *bool 字段，
  query/json 名 has_active_package，description 中文
- Service ListStandalone 将 HasActivePackage 映射为 filters["has_active_package"]
- Store applyStandaloneFilters 新增 EXISTS/NOT EXISTS 子查询，
  使用 constants.PackageUsageStatusActive，限制 master_usage_id IS NULL
  且 deleted_at IS NULL，所有查询路径（默认/两阶段/并行）均复用此函数

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/store/postgres/iot_card_store.go

@@ -895,6 +895,16 @@ func (s *IotCardStore) applyStandaloneFilters(ctx context.Context, query *gorm.D
 	if carrierName, ok := filters["carrier_name"].(string); ok && carrierName != "" {
 		query = query.Where("carrier_name LIKE ?", "%"+carrierName+"%")
 	}
+	// has_active_package 过滤：是否存在生效中的主套餐记录
+	if hasActivePackage, ok := filters["has_active_package"].(bool); ok {
+		subQuery := s.db.WithContext(ctx).Table("tb_package_usage pu").Select("1").
+			Where("pu.iot_card_id = tb_iot_card.id AND pu.status = ? AND pu.master_usage_id IS NULL AND pu.deleted_at IS NULL", constants.PackageUsageStatusActive)
+		if hasActivePackage {
+			query = query.Where("EXISTS (?)", subQuery)
+		} else {
+			query = query.Where("NOT EXISTS (?)", subQuery)
+		}
+	}
 
 	return query
 }