The Baltimore Planning Commission recommended Thursday that the city move forward with a proposal to revitalize the Inner Harbor by replacing the aging Harborplace pavilions with a mixed-use development of housing, shops, offices and a park. Commissioners voted in support of legislation that will now move to the City Council for hearings and a vote. Acknowledging opponents’ concerns about rushing review of a plan that developers unveiled less than two months ago, commissioners agreed that the city must act with urgency to restore a city treasure for future generations.