feat(room): 增加加入令牌及分块传输支持

- 后端Room和MessagePayload新增加入令牌字段，创建房间返回包含令牌
- 新增房间加入令牌验证接口，加入时需提供房间号和令牌
- 前端HomeView新增加入令牌输入框及验证逻辑
- Clipboard工具增加写入API支持及复制按钮
- FileDropZone支持选择文件夹批量上传
- FileMessage和ImageMessage新增分片进度提示及失败重试功能
- API层新增分块上传及断点续传实现，支持大文件分片上传
- 文件上传存储时计算文件sha256，响应中返回该值
- 下载接口支持断点续传，优化大文件下载体验
- README新增加入令牌安全说明及压力测试使用示例
- 资源清理与配置优化，添加磁盘使用水位阈值控制

frontend/package-lock.json

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