feat: implement Rust proxy gateway for vLLM Responses API#24
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Replaces the Python gateway stub with a full Rust implementation using axum, reqwest, and tokio. Supports both streaming (SSE) and non-streaming proxy modes, hop-by-hop header filtering, API key injection, and comprehensive error mapping (502/504). Includes 11 tests covering passthrough, auth, streaming, error propagation, mid-stream failure, connection errors, and timeouts. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Sébastien Han <seb@redhat.com>
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Summary
--llm-api-base) and integrated (serve <model>spawning vLLM as a subprocess)config,proxy,app,servermodules with a clean separation of concernsTest Plan
cargo test(11/11 green)cargo clippy --all-targets -- -D warningscargo fmt -- --check🤖 Generated with Claude Code