Summary

• backport upstream /healthz endpoint and regression coverage
• backport websocket client IP handling/tests for Responses websocket logging
• backport management API proxy resolution for API-key based auth entries
• keep the backport scoped to commits that applied cleanly or were resolved with minimal merge cleanup

Upstream commits

• 7ee37ee feat: add /healthz endpoint and test coverage for health check
• caa529c fix(openai): improve client IP retrieval in websocket handler
• ada8e29 feat(api): enhance proxy resolution for API key-based auth

Testing

• go test ./internal/api ./internal/api/handlers/management ./sdk/api/handlers/openai -count=1
• go test ./...