refactor: 使用 zstd 和纯 Python 替代 gzip 和 rsync - #26
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将归档压缩方式从 tar+gzip 改为 tar+zstd，使用 Python 库而非 CLI 调用。 主要改动： - 添加 zstandard 依赖 - 使用 tarfile 和 zstandard 库替代 tar CLI - 文件扩展名从 .tar.gz 改为 .tar.zst - 使用 filter='data' 增强解压安全性 优势： - 更快的压缩/解压速度 - 更好的压缩率 - 纯 Python 实现，跨平台兼容性更好 - 自动避免 macOS 扩展属性导致的跨平台问题（不会产生 ._ 文件）
- 移除对 rsync 的依赖 - 实现 _sync_with_checksum 方法，使用 SHA-256 进行文件内容比较 - 保持与 rsync --checksum 等价的时间戳行为 - 统一使用 SHA-256 哈希算法，与项目其他部分（target、dependency、checksummer）保持一致
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将归档压缩方式从 tar+gzip 改为 tar+zstd，并移除对 rsync 的依赖，改用纯 Python 实现。
主要改动：
优势：