add custom baseurl for cua

[NikhilShahi]

Summary

Changes

Validation

• yarn lint
• yarn build

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Note

Low Risk
Additive optional typing and request payload field with no changes to auth or core request handling beyond forwarding the new property.

Overview
Adds optional baseUrls on CUA task start so callers can point the OpenAI provider at a custom endpoint (e.g. Azure OpenAI) alongside existing custom API keys.

Introduces CuaBaseUrls with an optional openai field on StartCuaTaskParams, exports it from the public types package, and bumps the SDK to 0.92.3. An integration test asserts POST /api/task/cua includes baseUrls in the request body when set.

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