Projects & Groups删除空组 / Delete empty group删除空组 / Delete empty group DELETE /api/groups/:groupId 仅所有者可删除；含项目或子组时返回 409。 / Owners only; nonempty groups return 409. Request Responses200401403404409成功 / Successsteamharness 标准错误响应。steamharness 标准错误响应。steamharness 标准错误响应。steamharness 标准错误响应。