SCHENECTADY — The city Planning Commission approved a 124-room Courtyard by Marriott hotel at Mohawk Harbor as part of Galesi Group’s plans to develop the site with a casino and housing. Dan Hershberg of the Albany engineering firm Hershberg and Hershberg presented the design, saying he believes the upscale hotel would be a good fit for the casino site. “We believe it’s an ideal fit for the property,” Hershberg told the Planning Commission during a meeting Wednesday night, “b