A 27-year-old patient complains of irregular menstruation with delays of 2-3 months, significant body weight gain, hirsutism. She has been married for the last 5 years and had no pregnancies. Vaginal examination shows that the uterus is under 4 cm in size, on both sides there are dense mobile ovaries 4-5 cm in size that are painless during palpation. Ultrasound detects bilateral enlargement of the ovaries to 10.5 cm³, thickening of the ovarian capsule, and 8 immature follicles 5-6 mm in diameter, located on the periphery like a "necklace". What is the most likely diagnosis in this case?