Singletary discusses Smith and Hill . . . and Garcia and Vick

If Alex Smith and the 49ers agree to a new contract, he will compete with Shaun Hill for the starting quarterback job, coach Mike Singletary told reporters tonight after the team’s first “state of the franchise” address in San Mateo.   Also, Singletary said he has not ruled out the possibility of the team acquiring quarterback Michael Vick, who is serving a prison sentence on federal dog-fighting charges.