By Sidhartha Banerjee Quebec Premier François Legault, one year away from the general election and deeply unpopular with the electorate, announced a major cabinet shuffle on Wednesday and promised to soon present a new vision for the province’s economy. He also pledged to make radical changes to the public service, saying the system needs a “shock treatment” to get out of its lethargy. It’s all part of a plan to revive the fortunes of his party, which according to polls is at risk of disappearing from the electoral map after it won a second mandate three years ago with a decisive majority. In front of his new cabinet on Wednesday, the premier suggested his planned changes for the next year will not be easy, but are necessary. “At my age,…