feat(providers): add Eden AI provider (Chat Completions + Responses)

[tristantelleb]

What

Adds Eden AI (edenai.co) as a built-in provider through the registry architecture (docs/adding-new-provider.md). Eden AI is an OpenAI-compatible aggregator that routes to 100+ models across many providers using the provider/model id format (e.g. openai/gpt-4o), plus a special @edenai auto-router id.

Two variants are registered, mirroring the existing openrouter and openai-responses providers:

Provider	Type	Endpoint
Eden AI	OpenAI (extends OpenAICompatible)	POST https://api.edenai.run/v3/chat/completions
Eden AI (Responses)	OpenAIResponses	POST https://api.edenai.run/v3/responses (stateful)

Both authenticate with the Eden AI API key as a Bearer token, and model discovery uses GET https://api.edenai.run/v3/models.

Files

• src/shared/types/provider.ts — EdenAI + EdenAIResponses enum entries
• src/shared/providers/definitions/eden-ai.ts + models/eden-ai.ts
• src/shared/providers/definitions/eden-ai-responses.ts + models/eden-ai-responses.ts
• src/shared/providers/index.ts — side-effect registration imports

Design note

The Responses variant uses a dedicated model class rather than the shared normalizeOpenAIResponsesHostAndPath helper. Eden AI keeps the version segment in the path (.../v3/responses), and the shared helper appends /v1 to any host not ending in /v1, which would produce an incorrect .../v3/v1/responses URL. The dedicated class routes requests explicitly to ${apiHost}${apiPath}, matching the pattern in models/openai-responses.ts.

Testing

• pnpm exec biome lint on all changed files: clean.
• pnpm run check (tsc): the new Eden AI files introduce zero type errors.
• Contract invariants verified manually: unique provider ids, and every curatedModelId is present in defaultSettings.models.

⚠️ Heads-up unrelated to this PR: on current main (9c1db31), src/shared/providers/index.ts:29 imports ./definitions/github-copilot, but that file is not present in the tree. This causes pre-existing failures in pnpm run check and index.contract.test.ts independent of this change. Happy to rebase once that lands.

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[tristantelleb]

@themez , could you please take a look at the PR?

The goal is to add an EU-based provider, similar to OpenRouter, to Chatbox. We noticed that some of our users also use Chatbox, so we thought it could be valuable to explore a collaboration.

Best regards,
Tristan