Raise the local stream cap to 120 fps

[DjDeveloperr]

Summary

• Added --local-stream-fps for local daemon/UI/service launches and propagated it through metadata and /api/health.
• Updated the native H.264 encoder and WebRTC refresh pacing so local quality streams can pace cleanly up to 120 fps without unbounded backlog.
• Kept the default local cap at 60 fps and preserved the separate realtime/remote stream path.
• Updated docs and operator guidance to describe the new local high-refresh setting.

Testing

• cargo test --manifest-path server/Cargo.toml
• npm run build:cli
• Restarted the daemon on port 4312 with --local-stream-fps 120 and verified /api/health reports localStreamFps: 120.