The IPGeolocation plug was setting session data, but the live_session
wasn't forwarding it to the LiveView mount. Also removed the root-path
restriction so geolocation works on any initial page load.
Use CF-IPLatitude/CF-IPLongitude headers instead of making HTTP calls
to ip-api.com on every page load. Eliminates ~500ms latency, external
API dependency, and flaky tests.
Also disable test server to prevent port conflicts during development.
