The ground floor of the historic Grand Hotel, empty for two years, will soon be bustling again. A joint venture between Phoenix Charter School and NeighborWorks Umpqua will open Wednesday in the Roseburg hotel, giving students real-world sales experience and helping farmers, cooks and artisans sell their goods. The endeavor also will give new purpose to a building that’s been a downtown landmark for more than a century. The store, Umpqua Local Goods, will be an expansion and a relocation of a store the school opened in December on Southeast Jackson Street. The new store will be larger and have …