[docs] Update API reference docs

[github-actions]

Automated daily update of API reference documentation.

This PR was generated by downloading the latest OpenAPI spec from
https://cloud.agenta.ai/api/openapi.json and regenerating the
Docusaurus API docs.

Changes include:

• docs/docs/reference/openapi.json — updated OpenAPI spec
• docs/docs/reference/api/*.api.mdx — regenerated endpoint docs
• docs/docs/reference/api/sidebar.ts — regenerated sidebar

If this PR is empty (no file changes), it will not be created.

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All committers have signed the CLA.

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