A warehouse inventory robot does not need to be fully autonomous on day one. The highest-ROI prototype is a slow rover with a vertical camera mast, barcode or QR scanning, strong lighting and a route checklist. It finds shelf gaps and wrong labels while a human supervises.
Start with teleoperation and data capture. Once routes are repeatable, add fiducial markers, AprilTags or line tape for assisted navigation. This keeps the project useful before it becomes complex.