Add four new test files covering previously-untested handler functions
to raise total coverage from 57.7% to 60.0%:
- handlers_misc_coverage_test.go: minidata, trend weapons, etc points,
equip skin history
- handlers_cafe_coverage_test.go: cafe duration bonuses, daily cafe,
cafe duration
- handlers_festa_coverage_test.go: mezfes data, festa voting, entry,
charge, prizes, state queries, member enumeration
- handlers_event_coverage_test.go: weekly schedule, login boost,
scenario data, friends/blacklist operations
Also make mockCharacterRepo.ReadEtcPoints configurable to support
etc points handler tests.
