chore(lint): drop G/T rules (1895 G004 would require dedicated pass)

The 1895 logging-f-string violations are a style preference; manual
conversion to lazy %% formatting is a dedicated effort outside the
scope of the lint-cleanup campaign. Remove unused pytest import.

tests/unit/domains/auth/test_passwords.py

@@ -1,5 +1,4 @@
 """Tests for app.domains.auth.passwords (bcrypt direct, no passlib)."""
-import pytest
 
 from app.domains.auth.passwords import hash_password, verify_password