Add group culture, alumni, startups pages and update publications

- Add Life page (group culture, social activities, working environment)
- Add Alumni page (graduated students career paths and achievements)
- Add Startups page (entrepreneurship support, industry collaborations)
- Update papers.bib with 75+ papers from 2015-2026
- Add Google Scholar link to config
- Add Highlights section to About page
- Extend publications page to cover 2015-2026

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

Author: wabyking