A 42-year-old woman from rural Maharashtra presents with progressive fatigue and dyspnea on exertion for 8 months. She reports heavy menstrual bleeding for the past 2 years. On examination, she is pale with glossitis and angular cheilitis. Blood pressure is 110/70 mmHg. Laboratory investigations reveal: Hemoglobin 7.2 g/dL, MCV 62 fL, MCH 18 pg, serum ferritin 8 ng/mL (normal 30–300), serum iron 35 µg/dL (normal 60–170), TIBC 420 µg/dL (normal 250–425), transferrin saturation 8% (normal 20–50%). Peripheral blood smear shows microcytic hypochromic RBCs with target cells. What is the most likely diagnosis?