refactor: simplify SimDeck service lifecycle

[DjDeveloperr]

Summary

• Replace the old workspace/project daemon flow with a single reusable SimDeck service lifecycle.
• Make bare simdeck the primary UI entrypoint, with -p/--port, -a/--autostart, and --open documented in help.
• Hard-error removed simdeck ui and simdeck serve commands.
• Add long-running stream and accessibility metrics, reset the stream pipeline after the last subscriber disconnects, and preserve Android SDK environment for LaunchAgent services.
• Simplify docs and skills/simdeck/SKILL.md for the new service model.

Validation

• npm run format
• cargo test --manifest-path packages/server/Cargo.toml
• npm run --prefix packages/client test
• npm run test:github-actions
• npm run test:integration-harness
• cargo clippy --manifest-path packages/server/Cargo.toml --all-targets -- -D warnings
• npm run docs:build
• npm run format:check
• npm pack --dry-run
• git diff --check

Manual smoke

• Exercised service lifecycle, iOS device commands, fixture install/launch/uninstall, selector actions, gestures, screenshots, recording, raw stream, stats/logs/sample, batch, and Maestro.
• Exercised Android AVD boot/list/describe/screenshot/tap/shutdown under the LaunchAgent service.
• Verified Chrome WebRTC stream connects, frame counters advance over 30 seconds, packet loss stays at 0, and closing the tab drops active streams to 0 with a stream pipeline reset.

[coderabbitai]

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