feat: add simulator audio to WebRTC streams

[DjDeveloperr]

Summary

• Add simulator and Android emulator audio to the WebRTC live stream as a PCMU audio track alongside video.
• Capture per-simulator host audio with Core Audio process taps scoped to the selected iOS simulator or Android emulator process tree.
• Suppress direct simulator/emulator hardware output while the tap is active, so audible playback comes through the browser WebRTC audio element when Sound is unmuted.
• Add a web menu Sound toggle that is muted by default, plus docs for WebRTC audio behavior and Android emulator audio capture.

Notes

• macOS 14.2+ is required for Core Audio process taps.
• Android emulators launched by SimDeck keep host audio enabled so there is audio for the process tap to capture; the active tap mutes direct hardware output and routes samples into WebRTC.
• The legacy H.264 WebSocket fallback remains video-only.

Testing

• cargo fmt --manifest-path packages/server/Cargo.toml --check
• cargo clippy --manifest-path packages/server/Cargo.toml --all-targets -- -D warnings
• cargo test --manifest-path packages/server/Cargo.toml
• npx prettier --check .
• npm run --prefix packages/client typecheck
• npm run --prefix packages/client test
• npm run --prefix packages/client build
• npm run build:cli
• npm run build:packages
• npm run package:vscode-extension
• npm run test:github-actions
• npm run test:studio-provider
• npm run test:integration-harness
• npm run test:integration:fixture
• GitHub Actions CI run 26724651601 passed all jobs

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-simulator-audio-streaming

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