There were times this summer when Matthew Tkachuk wondered if he would be ready for training camp, wondered if the fractured sternum that he tried to play through in the Stanley Cup Final would allow him to be on the ice when the season started. With that, the Eastern Conference champion Florida Panthers have their first win of the season — their leading scorer is ready for Thursday’s start of training camp. “I feel really good,” Tkachuk said Wednesday at the team’s media day, the annual prelude to camp starting.