unit-test-Backend-API-Routes

• Clear Description: This MR adds comprehensive unit tests covering core authentication, RBAC, and critical API routes to improve reliability and prevent regressions.

What’s Covered

• Auth token creation & validation
• Role-based access control enforcement
• Health and root endpoints
• CRUD and permission checks for Users, Patients, Doctors, Consultations, Queues, Medicines, and Medical Camps
• Queue state transition validation Testing Approach
• Mocked DB and auth dependencies via conftest.py
• Role-based test cases (Admin, Doctor, Patient)
• Isolated test database (SQLite in-memory)

This ensures consistent behavior across routes and validates edge cases like invalid transitions and unauthorized access.

• Checklist: A checklist of completed tasks, such as:
  • Code follows project API guidelines (if applicable).
  • Tests are included and passing.
  • Documentation is updated (if applicable).
  • Code adheres to project coding standards.
• Related Issue(s): Link to any relevant issues using Closes #23 (closed)