chore: Use orval to replace ts-to-zod

[ZhongpinWang]

Context

Closes SAP/ai-sdk-js-backlog#367.

What this PR does and why it is needed

In favor of Zod v4 (currently imported from Zod package v3 with the path zod/v4), we replaced ts-to-zod with orval.

As discussed with @deekshas8 , we decided to also remove the schema tests.

We now generate zod schema for prompt-registry as promptTemplatePostRequestSchema aka. the new registryControllerPromptControllerCreateUpdatePromptTemplateBody zod schema is used in Orchestration package for supporting prompt template in JSON string.

Sidenote:

We cannot at this point move to Zod package version v4 yet, as LangChain still depends on Zod package v3 (but support v4 contained by the v3 package). The toJSONSchema() won't parse description etc. in properties correctly if we provide a zod object created by package v4. I described this also in #854 (comment).

🤯 Notice: Zod package v4 ≠ Zod v4. Zod v4 can come from Zod package v4 or Zod package v3.

[deekshas8]

Can you also remove this schema-tests package from pnpm workspaces file?

[deekshas8]

The object "registryControllerPromptControllerCreateUpdatePromptTemplateBodyaspromptTemplatePostRequestSchema" is exported from the index.ts but marked as @internal

This check is still failing. Since exporting it originally was a mistake anyway, I would remove it from the index.ts. Is also a quick win.

[ZhongpinWang]

The object "registryControllerPromptControllerCreateUpdatePromptTemplateBodyaspromptTemplatePostRequestSchema" is exported from the index.ts but marked as @internal

This check is still failing. Since exporting it originally was a mistake anyway, I would remove it from the index.ts. Is also a quick win.

Cloud SDK PR is still not merged, thus, this error. But I can remove it and import from internal in orchestration. If not using alias, we will be importing registryControllerPromptControllerCreateUpdatePromptTemplateBody from internal in orchestration, if that is wanted. Or we allow alias in internal? I am not sure about the style guide here.

[deekshas8]

LGTM 🚀

GitHub seems to have a bug preventing me merge the PR even when it is approved. Try dismissing the review.