Doctor Desktop

The doctor list is filtered by department, not specialty. General Medicine returns an empty list with no message, and Deepa Menon (General Medicine, with slots) is never offered.
Steps to Reproduce:

1. Open patient Babu and click Book Appointment → Scheduled.
2. Select Department = General Medicine and open the Doctor list.
3. Change Department to Outpatient (OPD) and open the Doctor list.
   Expected Result: General Medicine lists its doctors, including Deepa Menon; an empty department shows "No doctors available".
   Actual Result: Step 2 shows an empty list with no message. Step 3 lists Arjun Krishna, Arjun Mehta and Lakshmi Reddy. Deepa Menon is in neither list.