A 72-year-old woman from rural Maharashtra presents to the emergency department after a fall at home while walking to the kitchen. She complains of severe pain in the right hip and is unable to bear weight on the right lower limb. On examination, the right leg is held in flexion, adduction, and internal rotation. Hip movements are severely restricted and painful. X-ray pelvis shows a fracture of the femoral neck with the fracture line extending across the entire neck, and the proximal fragment is displaced superiorly and medially relative to the distal fragment. The fracture is classified as Garden Grade IV. What is the most appropriate initial management for this patient?