MIAMI — Search-and-rescue teams made their way into the Florida Keys’ farthest reaches Tuesday, while crews labored to repair the single washed-out highway connecting the islands and rush aid to Hurricane Irma’s victims. Federal officials estimated one-quarter of all homes in the Keys were destroyed. Two days after Irma roared into the island chain with 130 mph winds, residents were allowed to return to the parts of the Keys closest to Florida’s mainland.