Add stream control APIs and harden simulator streaming

[DjDeveloperr]

Summary

• Extend the WebRTC control data channel with stream-control messages for profile changes, keyframes, snapshots, and client stream stats
• Add simdeck stream <udid> for raw Annex B H.264 output from the native simulator session
• Harden private SimulatorKit input handling with guarded Xcode 26 Indigo mouse support, HID service warm-up, and touch retry behavior
• Avoid spawning xcodebuild -version from the private display bridge by reading Xcode version metadata directly
• Document the stream command, WebRTC control messages, and direct simulator boot behavior

Testing

• cargo fmt --manifest-path server/Cargo.toml --check
• cargo clippy --manifest-path server/Cargo.toml --all-targets -- -D warnings
• cargo test --manifest-path server/Cargo.toml
• npm run build:client
• npm run build:cli