feat: add configurable cookie notice

[bao-cn]

Summary

Implement the configurable first-visit cookie and local-storage notice in the terminal.

Implementation

• Add cookieNotice.enable and message configuration support.
• Preserve compatibility with the legacy string configuration.
• Prompt at the end of terminal scrollback when no stored decision exists.
• Persist y, n, and Ctrl+C decisions in localStorage.
• Add configuration, consent-state, and terminal behavior tests.

Behavior and compatibility

The notice is disabled when cookieNotice.enable is false. Existing string-form cookieNotice values remain supported. This PR depends on refactor/config-path.

Risk

The main risk is repeated prompting or incorrect consent persistence; focused tests cover parsing and storage behavior.

Verification

npx prettier --check .
npm run lint
npx tsc --noEmit --incremental false
npm test
npm run build

All checks passed, including desktop and mobile browser interaction checks.

Checklist

• The change is focused.
• Runtime validation, tests, configuration examples, and documentation are updated.
• No sensitive browser data is read or transmitted.