fix(hdr): send active Windows display metadata for native HDR

[zortos293]

Read the current Windows HDR output via DXGI and carry its measured minimum, peak, full-frame luminance, primaries, and white point through Qt’s transient runtime capability to CloudMatch. Match the window’s monitor, refresh on output changes, and omit incomplete metadata rather than treating SDR or stale values as calibration. An HDR-capable swapchain remains usable when measurements are missing.

Validate the optional monitor fields in the Rust core and serialize them in the official request units. Pair-only Wayland snapshots and the existing requested-content fallback remain unchanged. SDR still sends displayData:null; native HDR keeps the separate AI TrueHDR filter disabled. Document which mapping is inferred from the official client’s implementation rather than a captured HDR session.

Verification: core unit tests, cargo fmt --check, strict core Clippy, and git diff --check pass. Qt Windows tests and a live monitor comparison are pending on the local Windows build.

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