- Rename Go module from github.com/cclohmar/ReceiptNext to NextExpense
- Update all import paths across 7 Go source files
- Update templates (titles, headings, branding)
- Update static files (manifest.json, sw.js, CSS)
- Update config (Makefile, install.sh, .env.example)
- Update README with new name and URLs
- Rename service file receiptnext.service -> nextexpense.service
- Update install paths, service names, log paths in install.sh