Add npm support metadata

[alejandrorivas-pixel]

Summary

• add npm homepage metadata for the package README
• add npm bugs metadata pointing to the public issue tracker

Validation

• node -e "const p=require('./package.json'); if (p.name !== 'orb-billing' || p.homepage !== 'https://github.com/orbcorp/orb-node#readme' || p.bugs?.url !== 'https://github.com/orbcorp/orb-node/issues') process.exit(1)"
• node scripts/utils/make-dist-package-json.cjs preserves homepage and bugs metadata
• git diff --check