docs(website): add useMicrophone hook documentation

[oddFEELING]

Follow-up to #198 (the useMicrophone hook). Adds the documentation that was deliberately deferred from that PR so the hook PR could be reviewed on its own.

Summary

• Docs page — docs/browser/useMicrophone.mdx plus docs-zh-hans/ and docs-zh-hant/ translations. Each has a single interactive tsx live demo covering the full flow: open/close the mic, an animated input-level meter, record/stop, pause/resume, and an <audio> element for playback.
• API reference — website-docusaurus/api/useMicrophone-README*.md for the three locales, generated via pnpm gend from the hook's interface.ts JSDoc. The %%API%% marker on the docs page picks these up.
• Hook registry — entry added to scripts/hook-registry.json under the browser category so blog posts can link to the canonical URL.
• llms.txt / llms-full.txt updated by the website build to include the new hook (113 → 114).

Verified locally

• cd packages/website-astro && pnpm build — all 462 pages build, including /browser/usemicrophone/ and both zh locales.
• Ran the dev server and exercised the live demo in a browser: mic open/close, level meter, record/stop, pause/resume, and clip playback all work.
• The %%API%% marker resolves to the generated options table.
• eslint . clean.

Canonical URL: https://reactuse.com/browser/usemicrophone/

[oddFEELING]

@childrentime , useMicrophone docs are ready.

Please check that the Chinese docs are correct. I wrote in english and used AI to translate.