Follow-up for salvaged PR #66633 (fixes #66630): - 5 tests: nested gateway.api_server discovery, port/key/host/model_name bridged into extra, explicit extra wins over top-level key, non-platform gateway keys (streaming/timeout) not misparsed, gateway.platforms.api_server path regression-guarded. - docs: api-server.md (en + zh-Hans) now documents the gateway.api_server YAML section instead of 'not yet supported'.
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