A 28-year-old man from rural Maharashtra presents with a 2-week history of dark-coloured urine, facial puffiness, and mild dyspnoea. He reports a sore throat 3 weeks prior. On examination, BP is 158/98 mmHg, JVP is elevated, and bilateral ankle oedema is present. Urine dipstick shows 3+ protein and 3+ blood. Serum creatinine is 1.8 mg/dL (baseline ~0.8), and serum albumin is 3.2 g/dL. Complement C3 levels are low. Anti-streptolysin O (ASO) titre is markedly elevated. What is the most likely diagnosis?