feat: allow provider-level store option

[cyhhao]

Background

Provider options currently support baseURL/apiKey and setCacheKey, but there is no way to set the OpenAI Responses store flag at the provider level. This makes users repeat store=false for every model.

Changes

• Read provider.options.store in ProviderTransform.options and emit it into request options.
• Add store to the provider options schema so it is documented and validated.

Verification

• bun test test/config/config.test.ts

[github-actions]

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[github-actions]

The following comment was made by an LLM, it may be inaccurate:

I found a potential duplicate:

Related PR:

• feat: add configuration for open ai store option on provider level #7315 - feat: add configuration for open ai store option on provider level
  • URL: feat: add configuration for open ai store option on provider level #7315

This PR appears to be addressing the exact same feature - allowing configuration of the OpenAI store option at the provider level. Both PRs are focused on setting the store flag at the provider level to avoid repetition across models.