Unify update methods in device repository

Nobody has claimed this yet.

At present, the device repository has two methods for updating device fields:

- `update_images`
- `update_status`

These should be unified into an update method that takes a sparse structure of all editable fields of the device model.

This also allows us to remove the PUT `/api/devices/{id}/images` endpoint, in favor of a PUT `/api/devices/{id}` method, though we should limit user editable fields to just `images` for now.

AC:

- [ ] Only one method called `update` on the device repository exists
- [ ] Update calls of the previous methods to use this new method
- [ ] Remove the `PUT /api/devices/{id}/images` endpoint
- [ ] Introduces a `PUT /api/devices{id}`
- [ ] Ensure the images are returned along with the DeviceInfo struct
- [ ] Update any necessary unit/integration tests

Start by locating the device repository methods update_images and update_status, their callers, and the PUT /api/devices/{id}/images route. Trace the DeviceInfo structure and existing unit or integration tests before consolidating the update path. Done means the old method and route are gone, the new PUT /api/devices/{id} accepts the intended sparse update, and images are included in DeviceInfo.

Written by the indexing model from the issue text.