[DRAFT] feat(ui): move API to SDK

[PetrBulanek]

Summary

Linked Issues

Closes: #1692

Documentation

• No Docs Needed:

If this PR adds new feature or changes existing. Make sure documentation is adjusted accordingly. If the docs is not needed, please explain why.

[gemini-code-assist]

Summary of Changes

Hello @PetrBulanek, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a major architectural overhaul by migrating the existing API client and A2A extensions into a newly structured SDK. The primary goal is to enhance modularity, type safety, and error handling across the platform. The changes involve a comprehensive reorganization of code, the introduction of a more robust API interaction pattern, and a full update of the UI application to seamlessly adopt these new SDK capabilities.

Highlights

• SDK Restructuring: The agentstack-sdk-ts package has undergone a significant restructuring, moving from a monolithic API client to a modular design. This involves creating dedicated subdirectories for various A2A extensions (e.g., auth, services, ui) and API domains (e.g., configuration, connectors, contexts, model-providers, users), each with its own index.ts, schemas.ts, and types.ts files.
• New API Client and Error Handling: A new core API client (buildApiClient) has been introduced in the SDK, along with a standardized unwrapResult utility for handling API responses. This new approach also includes a robust error handling mechanism with ApiErrorException and specific error types (Http, Network, Parse, Validation) to improve reliability and developer experience.
• UI Application Alignment: The agentstack-ui application has been comprehensively updated to integrate with the new SDK structure. This includes adjusting imports, updating function calls (e.g., agentstackClient to agentStackClient, matchProviders to matchModelProviders), and aligning type definitions to consume the refactored SDK components.
• Enhanced Type Safety and Schema Definition: The refactoring heavily leverages Zod schemas and TypeScript types across all new and refactored modules. This ensures stronger type safety, clearer API contracts, and better maintainability for both the SDK and the UI.

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[gemini-code-assist]

Code Review

This pull request introduces a significant and well-executed refactoring, moving the API client logic and type definitions into a dedicated agentstack-sdk-ts package. This greatly improves the overall architecture by creating a clear separation of concerns, enhancing type safety, and establishing a more robust and reusable API client. The new structure with a core API builder, modular endpoints, and structured error handling is a major step forward.

My review has identified a recurring critical issue across several new Zod schema definitions where z.enum() is used incorrectly with TypeScript enums, which will cause runtime errors. I've left specific comments with suggestions to use z.nativeEnum() instead. I also found a minor opportunity to improve the robustness of a URL-building utility function.

Once these issues are addressed, this will be an excellent contribution to the codebase.