feat: Add OpenNOW Native streamer go Based

[capy-ai]

Summary

• add a standalone opennow-native-streamer Go project with versioned local IPC, Pion WebRTC control, GStreamer-backed media abstraction, native window scaffolding, and GFN input encoding foundations
• integrate the native backend into Electron main/renderer behind a new beta settings toggle while preserving the Chromium/WebRTC fallback path when disabled
• document the new ownership split, IPC model, platform notes, and Linux ARM / Raspberry Pi considerations

Validation

• npm run typecheck
• npm run build
• cd opennow-native-streamer && go build ./...

Notes

• This is a separate implementation from the existing C++ native-streamer work and is branched directly from dev.
• The native process currently ships a production-shaped control plane and media abstraction. The full GStreamer runtime path remains behind the gstreamer build tag for environments that have GStreamer/SDL2 installed.

[capy-ai]

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