- Create ADMIN_BACKEND_TESTED.md with test results
- Create test-admin-api.sh automated test script
- All endpoints tested and working:
- GET /admin/plans ✅
- POST /admin/plans ✅
- PUT /admin/plans/:id ✅
- DELETE /admin/plans/:id ✅
- GET /admin/payment-methods ✅
- GET /admin/users ✅
- GET /admin/users/stats ✅
- GET /admin/payments/pending/count ✅
- GET /admin/config ✅
- Security (401 without token) ✅
Backend fully tested and ready for frontend development
