A 38-year-old man from rural Maharashtra presents with a 4-month history of progressive back pain, low-grade fever, and night sweats. On examination, he has kyphotic deformity of the thoracic spine and a palpable paravertebral abscess. Plain radiographs show anterior vertebral body collapse with loss of disc space height at T5–T6. MRI reveals heterogeneous signal intensity in the vertebral bodies with epidural involvement causing cord compression. Sputum smear microscopy is positive for acid-fast bacilli. What is the most appropriate next step in management?