Add detection/segmentation/aDetailer models as a category

It would be a great resource to be able to easily share such models. There are way to few detector models shared, and they are very hard to find on the site.

I have written a guide on how to train them:
https://civitai.com/articles/4080/training-a-custom-adetailer-model-with-yolov8-detection-model

And I think the onsite trainer could easily be configured for this.