feat(desktop): add macOS and Windows app packaging

[awsl233777]

Summary

• add a Tauri desktop shell for Codex Mate
• reuse the existing local Node/Web UI server on 127.0.0.1:3737 instead of rewriting the API surface
• add desktop preparation/build scripts and macOS/Windows GitHub Actions bundle workflow
• document the desktop architecture and current Node runtime requirement

Validation

• npm run desktop:prepare
• npm run lint
• npm test
• local /api health-check returned HTTP 200 while node cli.js run --host 127.0.0.1 --no-browser was running
• npx tauri info recognized the Tauri app configuration

Notes

• Local Linux packaging was not run because this machine is missing Rust/Cargo and Linux Tauri system prerequisites (webkit2gtk-4.1, rsvg2). Windows/macOS bundle validation is expected to run through the added GitHub Actions workflow.
• The first desktop implementation still expects a system Node runtime. A later hardening pass can bundle a Node sidecar/runtime for fully self-contained desktop installers.

Closes #169

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 9ffba03 and a1f551e.

⛔ Files ignored due to path filters (16)

• package-lock.json is excluded by !**/package-lock.json
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• src-tauri/icons/icon.ico is excluded by !**/*.ico
• src-tauri/icons/icon.png is excluded by !**/*.png

📒 Files selected for processing (12)

• .github/workflows/desktop-build.yml
• doc/desktop.md
• package.json
• src-tauri/.gitignore
• src-tauri/Cargo.toml
• src-tauri/build.rs
• src-tauri/capabilities/default.json
• src-tauri/icons/icon.icns
• src-tauri/src/lib.rs
• src-tauri/src/main.rs
• src-tauri/tauri.conf.json
• tools/desktop/prepare-tauri-resources.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch pr-168

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