feat: add Mastodon/Fediverse comments via mastodon-comments web component

[claytonlin1110]

Summary

Adds Mastodon/Fediverse as an optional comment system using the mastodon-comments web component, so posts can show replies from a linked Mastodon toot.

Closes #981

Changes

• Config: New [params.page.comment.mastodon] with enable, host, and user in hugo.toml and exampleSite/hugo.toml.
• Comment partial: New Mastodon block in layouts/_partials/comment.html that only renders when Mastodon is enabled and the page has fediverse or mastodonTootId in front matter. Injects DOMPurify and mastodon-comments.js from CDN and outputs with the toot ID.
• Styles: Mastodon comment layout and component CSS variables in assets/css/_partial/_single/_comment.scss.
• i18n: New strings for noscript message, prompt text, and “post” link in i18n/en.toml and i18n/zh-CN.toml.
• Archetype: Comment in archetypes/default.md for optional fediverse / mastodonTootId front matter.

Usage

• Enable and set host and user under params.page.comment.mastodon.
• In each post that should have Fediverse comments, set fediverse (or mastodonTootId) in front matter to the toot ID for that post’s thread.

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[claytonlin1110]

@dillonzq Please review

[claytonlin1110]

@dillonzq Had a chance to review?