DETROIT — A federal judge listened Tuesday to Flint residents who were victims of the city’s lead-contaminated water, a step in determining whether she should sign off on a $641 million deal that would settle claims against the state of Michigan.More than a dozen people without lawyers signed up to speak, all in opposition. Thousands more are represented by attorneys who negotiated the settlement with Michigan and other parties and urged approval a day earlier.“This is a little unusual,” said U.S. District Judge Judith …