feat(design): 添加360视频和3D模型生成功能支持

- 在Design模型中新增video_url字段用于存储360度展示视频URL
- 在DesignImage模型中新增model_3d_url字段用于存储3D模型URL
- 设计路由新增生成视频接口，调用火山引擎即梦3.0 Pro API生成展示视频
- 设计路由新增生成3D模型接口，调用腾讯混元3D服务生成.glb格式3D模型
- 新增本地文件删除工具，支持强制重新生成时清理旧文件
- 设计响应Schema中添加video_url和model_3d_url字段支持前后端数据传递
- 前端设计详情页新增360度旋转3D模型展示区，支持生成、重新生成和下载3D模型
- 实现录制3D模型展示视频功能，支持捕获model-viewer旋转画面逐帧合成WebM文件下载
- 引入@google/model-viewer库作为3D模型Web组件展示支持
- 管理后台新增即梦视频生成和腾讯混元3D模型生成配置界面，方便服务密钥管理
- 前端API增加生成视频和生成3D模型接口请求方法，超时设置为10分钟以支持长时间处理
- 优化UI交互提示，新增生成中状态显示和错误提示，提升用户体验和操作反馈

frontend/package-lock.json

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@@ -1501,6 +1563,15 @@
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