feat(ai-gateway): Vercel provider

[tomek-labuk]

PR Title

Use the format feat/fix/chore(Product): Title, for example:

• feat(mesh): Add transparent proxy upgrade guide
• fix(gateway): Correct decK example in rate limiting how-to
• chore(ai-gateway): Bump plugin schema
• chore(platform): Fix issue template
• release: Kong Gateway 3.14

Description

Fixes #issue

Preview Links

Checklist

• Tested how-to docs. If not, note why here.
• All pages contain metadata.
• Any new docs link to existing docs.
• All autogenerated instructions render correctly (API, decK, Konnect, Kong Manager).
• Style guide (capitalized gateway entities, placeholder URLs) implemented correctly.
• Every page has a description entry in frontmatter.
• Add new pages to the product documentation index (if applicable).

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[Copilot]

Pull request overview

Adds documentation and metadata to introduce Vercel as an AI Gateway provider across the site (provider reference page, landing page card, how-tos, plugin example, and supporting site/tag data).

Changes:

• Add a new Vercel provider reference page and surface it on the AI providers landing page.
• Add two new Vercel how-tos (AI Proxy + AI Proxy Advanced) plus a shared prerequisite include.
• Register Vercel in site variables, tags schema, AI Proxy provider data, spelling dictionary, and add a Vercel icon.

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
jekyll.yml	Adds site.vercel label for reuse in docs.
app/assets/icons/vercel.svg	Adds the Vercel icon asset.
app/ai-gateway/ai-providers/vercel.md	New provider reference page for Vercel.
app/_landing_pages/ai-gateway/ai-providers.yaml	Adds a Vercel provider card to the landing page.
app/_kong_plugins/ai-proxy/examples/vercel-chat-route.yaml	Adds an AI Proxy example configuration for Vercel.
app/_includes/prereqs/vercel.md	Adds prerequisite steps for obtaining/exporting a Vercel API key.
app/_how-tos/ai-gateway/set-up-ai-proxy-with-vercel.md	New how-to for AI Proxy + Vercel.
app/_how-tos/ai-gateway/set-up-ai-proxy-advanced-with-vercel.md	New how-to for AI Proxy Advanced + Vercel.
app/_data/schemas/frontmatter/tags.json	Adds the vercel tag to the allowed tags list.
app/_data/plugins/ai-proxy.yaml	Registers Vercel as an AI Proxy provider in provider capability data.
.github/styles/base/Dictionary.txt	Adds Vercel to the Vale dictionary.

Comments suppressed due to low confidence (2)

app/_how-tos/ai-gateway/set-up-ai-proxy-with-vercel.md:40

• The TL;DR says to configure the plugin with the "OpenAI provider", but the example config uses provider: vercel; update the TL;DR wording to avoid telling readers to use the wrong provider.

tldr:
  q: How do I use the AI Proxy plugin with Vercel?
  a: Create a Gateway Service and a Route, then enable the AI Proxy plugin and configure it with the OpenAI provider, a Vercel model, and your Vercel API key.

app/_how-tos/ai-gateway/set-up-ai-proxy-advanced-with-vercel.md:40

• The TL;DR says to configure the plugin with the "OpenAI provider", but the example config uses provider: vercel; update the TL;DR wording to avoid telling readers to use the wrong provider.

tldr:
  q: How do I use the AI Proxy Advanced plugin with Vercel?
  a: Create a Gateway Service and a Route, then enable the AI Proxy Advanced plugin and configure it with the OpenAI provider, a Vercel model, and your Vercel API key.