Configure backend.ai-docs-toolkit package for npm registry publishing #5422
Description
Configure the backend.ai-docs-toolkit package for automated npm registry publishing with the same strategy as backend.ai-ui.
Why This Work is Needed
The docs-toolkit package needs to be published to npm registry to allow external projects to use it as a reusable documentation generation tool. Currently, the package exists but lacks the necessary npm publishing configuration and GitHub Actions automation.
Expected Outcomes
- Package metadata properly configured for npm registry (description, repository, license, keywords)
- GitHub Actions workflow set up for automated publishing (canary on main branch, versioned on tags)
- Publishing scripts created to handle version management and publish strategy
- Same publishing pattern as backend.ai-ui package for consistency
JIRA Issue: FR-2085