docs: add OCI Generative AI provider docs and logo

[fede-kamel]

Issue for this PR

Refs #29622 (asked for an OCI Generative AI provider; auto-closed as stale). The provider itself landed in models.dev as oci (anomalyco/models.dev#7087) and already works in OpenCode. This PR adds the docs and the logo for it. No issue is closed.

Type of change

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

What does this PR do?

Docs. Adds an "OCI Generative AI" section to providers.mdx (between Nebius Token Factory and Ollama), in the same shape as the neighbouring sections: where to create the API key (Console or oci generative-ai api-key create), /connect, the OCI_GENAI_API_KEY env var alternative, /models, and an opencode.json baseURL override for regions other than Chicago (the models.dev entry points at us-chicago-1). Two notes carry the things that actually trip people up: the IAM policy for request.principal.type='generativeaiapikey' has to exist before the key is created or every call is a 401, and the endpoint only serves Meta Llama, xAI Grok and OpenAI gpt-oss to API keys.

Logo. packages/ui/src/assets/icons/provider/oci.svg is byte-for-byte what the provider-icons-plugin in packages/ui/vite.config.ts fetches from https://models.opencode.ai/logos/oci.svg; without it the model picker shows the generic synthetic icon for OCI. sprite.svg and types.ts get the oci symbol/name in the position the spritesheet generator sorts them (after ollama-cloud, before nvidia), same as #42015 did for Merge Gateway.

How did you verify your code works?

Followed the docs as written, with a real OCI Generative AI API key and opencode 1.18.13:

$ export OCI_GENAI_API_KEY=...
$ opencode models | grep '^oci/'
oci/meta.llama-3.3-70b-instruct
oci/meta.llama-4-maverick-17b-128e-instruct-fp8
oci/meta.llama-4-scout-17b-16e-instruct
oci/openai.gpt-oss-120b
oci/openai.gpt-oss-20b
oci/xai.grok-4.20-non-reasoning
oci/xai.grok-4.20-reasoning
oci/xai.grok-4.3
oci/xai.grok-4.6

$ opencode run --print-logs -m oci/xai.grok-4.6 "Reply with the single word: pong"
... message=stream providerID=oci modelID=xai.grok-4.6 ...
... message="llm runtime selected" llm.runtime=ai-sdk llm.provider=oci llm.model=xai.grok-4.6
pong

The oci generative-ai api-key create and IAM policy statement in the docs are the exact commands used to mint the key for this run (policy first, then key). The logo renders as a single-colour mark in light and dark at 20, 28 and 64 px (currentColor, viewBox 0 0 24 24), and is the same asset models.dev shows on its own provider page.

Screenshots / recordings

Logo preview (light/dark) is a 900×120 PNG; happy to attach on request. It is the same mark as https://models.dev/logos/oci.svg.

Checklist

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

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

[fede-kamel]

Verification of this branch itself (in addition to the opencode run check in the description, which used the released binary):

• Docs build: bun run build in packages/web (Astro) completes with no errors; the built docs/providers/index.html contains the new section with anchor #oci-generative-ai.
• Logo: packages/storybook on this branch, UI/ProviderIcon → All Icons story renders 101 icons; the oci cell resolves to sprite.svg#oci and paints (non-empty <use> bounding box, currentColor). Same asset as https://models.dev/logos/oci.svg, so it matches what the provider-icons-plugin would fetch.
• sprite.svg parses as XML; every symbol still has a types.ts entry (the one pre-existing gap, llmgateway in types.ts without a symbol, is unchanged).

[fede-kamel]

@thdxr @adamdotdevin @rekram1-node @kitlangton — would appreciate a look when you have a moment.

Docs-only: the OCI Generative AI provider already works in OpenCode via models.dev (oci, anomalyco/models.dev#7087), but had no docs and showed the generic icon in the model picker. This adds a providers.mdx section (API key setup, the IAM policy that otherwise gives a 401, region override) and the oci logo in the sprite. No runtime code changes.