docs(web): add Boundless to the provider directory

[nahoc]

Issue for this PR

Closes #

No issue — this follows the "Adding New Providers" path in CONTRIBUTING.md.

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Adds a Boundless entry to the provider Directory in packages/web/src/content/docs/providers.mdx, placed alphabetically between Baseten and Cerebras. It follows the same four-step shape as the other API-key providers (console link → /connect → paste key → /models).

CONTRIBUTING.md says the catalog PR comes first, so that one is already open: anomalyco/models.dev#7342 (15 models, both checks green, reviewer bot reports no findings). This PR should land after it.

No code changes are needed, for two reasons I checked in the source rather than assumed:

• Boundless is a plain OpenAI-compatible host (npm = "@ai-sdk/openai-compatible", api = "https://api.inference.boundless.network/v1", env = ["BOUNDLESS_API_KEY"]), so OpenAICompatiblePlugin in packages/core/src/plugin/provider/openai-compatible.ts already constructs the SDK for it. It matches on the package name only, so nothing provider-specific is required.
• No icon is committed. providerIconsPlugin() in packages/ui/vite.config.ts fetches logos/<provider>.svg for every provider in api.json on buildStart, so boundless.svg and the regenerated sprite/types.ts come for free once the catalog PR merges. Committing them here would only create churn.

I deliberately did not touch popularProviders in packages/app/src/hooks/use-providers.ts or the featured array in dialog-connect-provider.tsx — those are maintainer curation, not something a new provider should add itself to.

How did you verify your code works?

bun install at the repo root fails on this machine while building tree-sitter-powershell (node-gyp), which is unrelated to docs, so I verified the page directly instead:

• Compiled the full providers.mdx with @mdx-js/mdx + remark-gfm after stripping frontmatter — compiles clean, 54 ### Directory entries, and the new heading sits between Baseten and Cerebras.
• prettier --check packages/web/src/content/docs/providers.mdx — passes.

The change is content-only inside an existing page: no new imports, components, or frontmatter.

Separately, while preparing the catalog entry I probed the live Boundless API to confirm what goes in reasoning_options, so the /models step reflects real behaviour — details are in the models.dev PR.

Screenshots / recordings

Not a UI change.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

English providers.mdx only; the locale copies are handled by the docs-locale-sync workflow.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍