Docs & Changelog: Add note about version or date for `/v1/responses` support

[Chungzter]

The OpenAI compatibility docs list /v1/responses. However, this feature is very recent:

• It was implemented in openai: add v1/responses support #13351
• It's part of the added features for v0.13.3 based on the full changelog.

The current docs present it as a standard feature without any indication of when it was added. The release notes for v0.13.3, v0.13.4, and v0.13.5 also don't mention it at all.

Adding a small note in either place would be super helpful:

• In the docs, something like:

Added in Dec 2025 (>=0.13.3)

• Or in the changelog for the relevant v0.13.x release:

Added support for the non-stateful OpenAI Responses API (/v1/responses). See docs for details.

Either one of these would prevent a lot of frustration since on versions <0.13.3, requests to /v1/responses return HTTP 404.

Thanks for the great work on Ollama. this feature is really valuable!