feat: add OpenRouter model provider

[vivekascoder]

Summary

Adds openrouter support in connectors.

• adds search functionality for openrouter mdoels.

Closes #342

Preview of the changes it does:

Screen.Recording.2026-08-21.at.3.50.12.PM.mov

Changes

• Add OpenRouter provider using its SDK for model discovery.
• Add caching, model search, metadata, and tests.

How was this tested?

• Passed pnpm build, pnpm test, pnpm typecheck, pnpm lint:ci, pnpm format:check, pnpm test:store:local, pnpm smoke and pnpm pack:dry.

Checklist

• I have read the contributing guidelines
• pnpm build, pnpm test, pnpm typecheck, pnpm lint:ci, and pnpm format:check pass locally
• Tests added/updated where it makes sense
• No hand-edits to generated code (packages/trueforge-sdk, .github/fern/openapi/openapi.json, docs/openapi.json) — fork PR omits SDK regen
• Docs / .env.example updated if configuration or behavior changed — not needed

---

Note

Medium Risk
Introduces a new LLM provider path and an outbound OpenRouter catalog fetch on catalog list, plus request attribution headers. Failures fall back to shipped presets, but catalog listing now depends on a remote API.

Overview
Adds OpenRouter as a well-known model provider (OpenAI-compatible adapter, default https://openrouter.ai/api/v1) so it can be configured like other built-in connectors.

The catalog ships a small OpenRouter preset list, then GET model-provider catalog syncs the live OpenRouter model list (5-minute TTL) via @openrouter/sdk. Empty/failed fetches keep the shipped presets. Runtime requests attach TrueForge app-attribution headers (HTTP-Referer, X-OpenRouter-Title).

Settings and the draft model picker now use fuzzysort so large catalogs (especially OpenRouter) can be searched by name/id/provider, including a per-provider “available to add” search.

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[changeset-bot]

🦋 Changeset detected

Latest commit: 6d1952a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@truefoundry/trueforge-core	Minor
@truefoundry/trueforge	Minor
@truefoundry/trueforge-ui	Minor
frontend	Patch

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