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- 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