Egor Dëmin — the Nets’ first lottery pick in 15 years — will miss the remainder of his rookie season due to increased plantar fasciitis in his left foot. While the combo guard will avoid surgery — and should return to basketball activity early in the offseason and be a full participant in the summer development program — having his promising debut season cut short will be a blow for the young Russian. “He’s been a kid that wants to play, wants to be out there, wants to develop, and nothing