Generate Node.js SDK v2.6.x reference docs

- Regenerate 79 existing docs with correct javascript code blocks
- Add 22 new docs (hasRole, connect, getVersion, use, addCollectionFunction, etc.)
- Code blocks now use forced javascript language tag via MilvusSdkDocsGen

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>