FALMOUTH — A wave of customers arrived at the opening of the bakery-cafe Maison Villatte in November, but the crowds weren’t a surprise. French-born owner Boris Villatte had already built a reputation on Cape Cod for his breads at Wellfleet’s PB Boulangerie, where he was co-owner. Villatte has his own patisserie-boulangerie now and patrons are standing in line for golden, crusty baguettes and buttery croissants.