Feature: status 插件优化

### Describe the problem related to the feature request

status 在文档中有着非常不错的输出，但实际使用时的输出似乎并没有文档中展示的那么齐全。


### Describe the solution you'd like

我希望：

- status 插件能够显示最上面那句话（`5 名四季酱正在为 20 个群和 2409 名用户提供服务。`）
- 插件在 bot 名称后能显示其平台
- 插件没有 bot 名的时候用「未知」代替

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

Start by locating the status plugin and comparing its current output with the documented example and attached screenshot. Done means the output includes the service summary, shows each bot's platform, and displays 「未知」 when a bot has no name.

Written by the indexing model from the issue text.