Spending the last 9 1/2 seasons in Baltimore and watching the New York Yankees and Boston Red Sox annually battle for playoff berths left Melvin Mora with one big wish in free agency. “The most important thing for Melvin, being that he’s 38 years old and has been playing on a sub-.500 team for many, many years, was to get to the postseason,” Mora’s agent, Eric Goldschmidt, said…