fix(native): enable DX11 VSync-off and G-Sync presentation

[zortos293]

Summary

• disable the implicit display-refresh present cap in Lowest Latency mode
• keep Cloud G-Sync presentation below the monitor refresh ceiling with 3 FPS headroom
• build and bundle a patched Windows GStreamer DX11 sink that opts into DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING and DXGI_PRESENT_ALLOW_TEARING when supported
• enable the tearing-capable DX11 path for the Windows native streamer process

Root cause

The native streamer configured GStreamer with sync=false, but its default auto present limiter still capped DX11 at the detected display refresh rate. Separately, GStreamer 1.26.8 calls Present(0, ...) without creating the swap chain with ALLOW_TEARING; under DWM this can remain refresh-paced and cannot correctly enter DXGI VRR.

Verification

• cargo test --manifest-path native/opennow-streamer/Cargo.toml --features gstreamer
• cargo check --manifest-path native/opennow-streamer/Cargo.toml --features gstreamer
• npm --prefix opennow-stable run typecheck
• npm --prefix opennow-stable test
• npm --prefix opennow-stable run lint (passes with pre-existing warnings)
• GStreamer patch applies cleanly to the pinned 1.26.8 source
• release workflow YAML parses successfully

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