PHOTOS BY ANDREA PHOX, andreaphox.com Jenny O’Hara stars in “The Forest” at New Jersey Repertory Company in Long Branch. Pam, a retired professor and an expert in feminism and folklore, knows perfectly well what the forest represents: A place of danger and disorientation, lurking outside the realm of life as you normally know it. She just never thought she would wind up in one herself. It’s not a real forest, of course. But the central character of Lia Romeo’s powerful new play “The Forest” — currently being presented at New Jersey Repertory Company in Long Branch, in its world premiere — find…