`serve` gave Moonlight clients no audio on Windows: the GameStream audio
stream thread was Linux-only (a non-Linux stub errored). Widen the
stereo path to Windows — the encode/RTP/AES-CBC/hand-rolled-RS(4,2)-FEC
logic is platform-neutral and already live-validated byte-identical on
Linux, and it now runs over the WASAPI capturer + the (already
cross-platform) `opus` crate. The cfg gates go from `linux` to
`any(linux, windows)`; only the surround path stays Linux-only because
its libopus *multistream* encoder needs `audiopus_sys` (a Linux dep) —
on Windows a surround request fails cleanly with a "use stereo" error.
Linux stays byte-identical (the `SessionEncoder::Surround` variant and
its match arm keep `#[cfg(linux)]`, so Linux compiles exactly as before).
Verified: clippy -D warnings + host test suite green on both
x86_64-pc-windows-msvc (73/73) and Linux (78/78).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
enricobuehler
1b502899d8