Release 0.3.1

Add custom GeoIP provider test API & setup wizard prefill

- Add backend and UI to test custom GeoIP HTTP providers, including robust JSON field detection and error reporting
- Prefill setup wizard steps with current server settings for smoother onboarding
- Update email config test to use current server SMTP settings only
- Improve QuestionForm UI with Switches and grid layout
- Update telemetry copy for clarity; widen setup wizard cards
- Upgrade yet-another-react-lightbox to 3.32.0
- Refactor trusted mode/geo IP mapping; minor bugfixes and cleanup