docs: add Lynx ecosystem renderer

[gaoachao]

Summary

• Add the Lynx A2UI renderer to the full ecosystem renderers list.
• Add Lynx A2UI to the reference renderers ecosystem overview.
• Include GitHub, npm, and documentation links for @lynx-js/genui/a2ui.
• Add a short highlight describing the ReactLynx renderer, MessageStore flow, catalog usage, and action forwarding.

Validation

• Ran git diff --check origin/main...HEAD.
• Verified the Lynx activity badges render without shields.io error text.

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[gemini-code-assist]

Code Review

This pull request adds documentation for the Lynx A2UI renderer (lynx-family/lynx-stack) to both the ecosystem and reference documentation. The feedback suggests updating the stars badge format in the ecosystem table to use the standard GitHub stars badge instead of a dynamic JSON query badge for consistency with other entries.

[gaoachao]

@gspencergoog Thanks for the suggestion. I updated the Lynx entry to keep the stars badge format consistent with the other renderer entries in the table.

I also ran the repo formatting script and fixed the formatting issue that caused the enforce-formatting CI check to fail locally. The latest commit is pushed, but the new workflow runs appear to require maintainer approval before they can proceed.

Could you please approve the CI run when you have a chance and continue the review?