Alamo City entrepreneur Gordon Hartman’s Soccer for a Cause has unveiled plans for a proposed $45 million expansion of Toyota Field, currently home of the NASL’s San Antonio Scorpions. Plans call for dramatic changes to the roughly 8,000-seat stadium that, once completed, would make it one of the nation’s premier soccer and special-events venues. The list of proposed improvements includes: • The addition of 10,000 seats — 9,000 of which would be constructed in a new second level that…