NEW YORK — Comcast is trumpeting its best year for traditional TV services in nearly a decade, even though it continues to lose TV subscribers.The number of traditional TV customers is still declining across the industry, and analysts say Comcast’s TV gains are largely coming from competitors, like AT&T and Dish, rather than young new cable customers who have never paid for cable before.Comcast said it is stemming its losses by luring customers with new TV-Internet packages, while keeping TV customers …