Replace 0.0.0.0/0 with RFC 5737 test ranges (198.51.100.0/24, etc.) in
persistence tests so saving geoblock rules to Caddy doesn't block real
traffic for concurrent test workers. The LAN Only preset save test uses
the API to verify saved values and immediately resets, minimizing the
window where block-all is active.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>