Add xAI Responses API support #5819
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Adds support for xAI's new Responses API while maintaining backward compatibility with the deprecated Chat Completions endpoint.
Changes
XAIAPITypeenum withchat_completions(default) andresponsesvariantsXAIProviderto support both API types in streaming and non-streaming modespub(crate)for cross-provider reusegrok_4_1_fast_non_reasoning_responses)Testing
cargo checkpassescargo fmtpassescargo clippy --all-targets --all-features -- -D warningspassesFixes #5774