Survivors of a deadly fire that tore through a West Oakland halfway house last month sued their former landlord and the nonprofits that acted as master tenants Wednesday in Alameda County Superior Court, saying their slum-like housing conditions were illegal and led to the inferno. The lawsuit brought by 15 former tenants alleges that the building near San Pablo and Mead avenues had no working fire alarms, sprinkler system, emergency lights or carbon monoxide detectors.