Provide and export CharacterCombatStatsService from CharactersModule,
create CombatModule (registering the combat entities, controllers,
CombatService and CombatEngineService, and importing TravelModule and
CharactersModule), and register CombatModule in AppModule so the three
combat endpoints (attack, get combat, post action) are reachable from
the running app.
Registers HuntingModule (POST /api/hunts) into the DI graph alongside its
new entities, and adds possibleMonsters (enabled LocationMonster pool,
weight-descending, empty when hunting is disabled) to
WorldService.getCurrentLocation. Also updates the pre-existing
DB-less app.e2e-spec.ts to override HuntingModule the same way the other
feature modules already are, since it now needs a real DataSource.
