fix: use [fibp] config section for test server
Merged
VI
8mo ago+3+3+0123456789-3-3-0123456789
The FIBP-only server expects [fibp] not [server] for the listen address.
Summary by cubic
Switch test server config from [server] to [fibp] so the FIBP-only server picks up listen_addr correctly. Updates the normal, TLS, and auth server fixtures in tests/conftest.py.