[Feature] Automatically traverse the entire folder when inferring images

[Dimon0000000]

issue

The current image inference feature can only infer images within a specified folder; images in subfolders within that folder are not automatically included.

I would therefore like to add a feature that allows me to specify a folder and have the system automatically process all the images within it for output; this would mean I could perform depth estimation on all of them simply by specifying a single folder (this requirement arose from the context of image classification).