LAS VEGAS—Attorneys for former Raiders receiver Henry Ruggs III launched a bid Wednesday to keep his medical records out of the hands of prosecutors charging him with driving under the influence in a fiery crash that killed a Las Vegas woman and cost Ruggs his spot on the team. Ruggs didn’t appear in person in court as a prosecutor filed additional felony charges of DUI causing substantial injury and misdemeanor possession of a gun while under the influence that could mean additional prison time if the 22-year-old former first-round draft pick is convicted. Outside court, Clark County District Attorney Steve Wolfson said Ruggs would serve at least a mandatory two years behind bars and could get more than 50 years if he’s found guilty of DUI causing death or substantial injury and felony reckless driving. Ruggs is accused of driving 156 mph with a blood-alcohol level of 0.16 percent—twice the …