docs(sandbox): list the Lizard community provider

[yuraoak]

Adds Lizard (lizard.build) to the sandbox provider guide so readers can find the community package and its setup instructions.

🎯 Changes

• Add @lizard-build/tanstack-ai under a new Community providers section, with supported features, required credentials, and a link to its public README.
• Update the provider page's updatedAt date.
• No TanStack package changes or changeset. Lizard maintains the adapter in its own repository.

This PR stays in draft until the npm release is available. The linked source and README are already public.

Testing

• pnpm test:pr passed with Node 24.8.0 and pnpm 11.9.0: React Native smoke checks, all 81 affected tasks, and the declaration-file scan.
• The documentation check scanned 835 Markdown files and found no broken links.
• Checked the new row and the linked README. This is easy to review as a two-file docs diff; no executable TanStack code changed.

Risk and rollback

The entry links to a package maintained outside TanStack. If the listing needs to be withdrawn, remove its row and section and revert the date update.

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested code changes locally with pnpm run test:pr, or these tests do not apply to this pull request.
• I fully understand the code in this pull request, including any code generated with AI assistance.
• Docs: I updated docs/ for this change, or this change is not user-facing.
• Changeset: I added a changeset (pnpm changeset), or this PR does not change a published package.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[changeset-bot]

⚠️ No Changeset found

Latest commit: e202010

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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