v1.1.0: Project cleanup and bug fixes

Changes:
- Add .gitignore to exclude unnecessary files
- Remove duplicate hero_info.csv (same as heroes.csv)
- Remove old backend/frontend/config folders
- Remove __pycache__ from version control
- Fix compare_profiles.py to use correct GA_SETTINGS_EXPERT

System verified working:
- 119 heroes loaded
- 109 items loaded
- All core modules functional