- .gitignore: remove .gitkeep exception, ignore wg-data/ entirely and
fix stale comment (directory is generated by the container, not
created manually)
- README: document init container behaviour in setup step 4, update
project structure (wg0.json -> wg-easy.db), align security section
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>