docs(configuration): document openai responses protocol - #563

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Thanks for the contribution! However, #562 was merged first and already addresses #556 with the same changes (documenting openai-responses protocol across all three locale files).

Your PR does have one piece of extra value that #562 lacks: the note about url accepting either the API base URL or the full /responses endpoint. That's a useful clarification.

You have two options:

1. Close this PR — since the core documentation gap is already filled by docs(configuration): document openai-responses protocol #562.
2. Rebase onto main and submit a smaller follow-up — keeping only the incremental note about URL flexibility (the base-URL-or-full-endpoint clarification) on top of what docs(configuration): document openai-responses protocol #562 already added.

Either way is fine — up to you!

@FenjuFu

Thanks @lizhengfeng101, and no problem that #562 landed first. I went with option 2 — opened #623 as a small follow-up on top of current main, keeping only the incremental note (that url accepts either the API base URL or the full /responses endpoint, since ensureResponsesEndpoint normalizes both). Docs-only, +2 lines per locale. This one stays closed.