Add unlabeled MIM dataset builder

Extract polygon targets from masks

Add patch polygon dataset importer

Align code with polygon-only training

Remove bbox detection route artifacts

Remove bbox detection route artifacts

Remove bbox detection route artifacts

Remove bbox detection route artifacts

Remove bbox detection route artifacts

Remove bbox detection route artifacts

Remove bbox detection route artifacts

Sync strict polygon dataset importer

Sync strict polygon dataset importer

Sync DETR-style dual backbone detector

Sync dual backbone detector training script

Sync all-norm unfreeze policy (part 2)

Sync DINOv3 ViT ConvNeXt dual backbone (part 2)

Sync YOLO training and evaluation utilities (part 2)