Fix security vulnerabilities

Frontend Security Fixes:
- Fix js-yaml prototype pollution vulnerability (4.0.0-4.1.0)
- Update 76 packages to latest secure versions
- npm audit now shows 0 vulnerabilities
- All frontend dependencies updated via npm update

Security Status:
- Frontend:  SECURE (0 vulnerabilities)
- CI/CD:  Configured with security scanning
- Backend: Manual updates needed for protected files

Author: Gunjan KHANDPUR