feat: log warnings and deprecations in global error handler
refactor(config): switch internal config access to config() helper
feat(config): add config loader, repository and helper
fix: fix admin render factory
refactor(guestbook): change module structure
refactor(guestbook): move guestbook mode switch to invokable controller
refactor(guestbook): extract file download action to invokable controller
refactor(guestbook): extract reply action to invokable controller
refactor(guestbook): extract edit action to invokable controller
chore: change psalm config