feat: add RSS and Atom feed options to blog plugin

[mesutoezdil]

Adds explicit feedOptions to the blog preset in docusaurus.config.js.

What changes

• type: ['rss', 'atom'] - generates both feed formats
• title, description, copyright - production-ready feed metadata
• Exposes /blog/rss.xml, /blog/atom.xml for EN
• Exposes /zh/blog/rss.xml, /zh/blog/atom.xml for ZH

Both feeds verified present in build output.

Closes #147

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[rootsongjc]

Nice improvement, and thanks for verifying both EN and ZH feeds in the build output.

One i18n point worth flagging. feedOptions.title and description apply globally, so the generated /zh/blog/rss.xml and /zh/blog/atom.xml will carry the English metadata:

• title: 'HAMi Blog'
• description: 'Latest news and updates from the HAMi project'

For a Chinese-audience feed, a localized title and description would read better in a feed reader. Docusaurus doesn't support per-locale feedOptions on a single blog instance out of the box, so the realistic options are:

1. Keep shared metadata as it is now. Fine as a baseline.
2. Run two blog plugin instances (one per locale) with localized feedOptions. More config, but gives true i18n metadata.

Not a blocker for this PR. Just raising it because ZH subscribers will see the English strings in their feed reader.

[mesutoezdil]

Thanks for the review.

Keeping shared metadata as the baseline for now. The English strings in ZH feed readers are acceptable at this stage.

Opened #452 to track ZH-localized feedOptions via a second blog plugin instance.