feat(app): import OAuth-backed Den providers

[pascalandr]

Dependency map

Pagecran/dev
`-- stack/provider-credential-contract-base          (A)
    |-- pr/den-managed-provider-sync                 (B)
    `-- stack/den-api-oauth-credential-handling      (C)
        |-- stack/oauth-device-flow-and-ui           (D)
        `-- stack/desktop-import-oauth-providers     (E)

Scope

• Includes map parts: A + C + E.
• Adds the LLM provider credential contract base for OAuth-backed OpenCode credentials.
• Adds Den API handling for API-key versus OpenCode OAuth-backed provider credentials.
• Adds desktop import support for OAuth-backed Den organization providers.
• Imports OpenCode OAuth auth JSON through the Den import credential endpoint while preserving existing API-key import behavior.

Tests

• pnpm --filter @openwork-ee/den-db build - PASS.
• From ee/apps/den-api: pnpm exec tsc -p tsconfig.json --noEmit - PASS.
• From ee/apps/den-api: pnpm exec bun test test/llm-provider-credentials.test.ts - PASS, 4 tests.
• pnpm --filter @openwork/app typecheck - FAILS in unrelated existing/baseline file src/react-app/design-system/extension-mesh-avatar.tsx because @paper-design/shaders-react types cannot be resolved. This PR does not touch that file or dependency.

Linked issues

• Partially fixes OpenAI models not available despite being connected #1855
• Helps fix Anthropic auth: disable OAuth or enable via custom provider #1072

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Project	Deployment	Actions	Updated (UTC)
openwork-landing	Ready	Preview, Comment, Open in v0	May 24, 2026 12:58am

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