网站建设需要：KiwiDB 大约是如何利用 BRaft 实现 Raft 功能的？

### Which kiwi functionalities are relevant/related to the feature request?

_No response_

### Description

注意到 Kiwi 使用了 Baidu 的 BRaft 库来实现 Raft，因此在这里请教（我想的话，groupid, multiraft 等理念，也都是源自于 BRaft）

### Proposed solution

_No response_

### Alternatives considered

_No response_

Trace Kiwi's use of Baidu BRaft in the repository, focusing on how groupid and multiraft relate to Kiwi's Raft functionality. Document the relevant architecture and integration points for the website, and verify that the explanation accurately reflects the implementation.

Written by the indexing model from the issue text.