add convnext tiny

pix2poly/224/image_bs2x16_convnext_tiny_fd256/checkpoints/best_val_iou.pth

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+size 454850717

pix2poly/224/image_bs2x16_convnext_tiny_fd256/checkpoints/latest.pth

@@ -1,3 +1,3 @@
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-size 454836509
+oid sha256:2f9124d6c3549bc50955fc2efc281bf1bb5146ad75a79caf730f9a86a0ebe890
+size 454836573

pix2poly/224/image_bs2x16_convnext_tiny_fd256/predictions_CH_val/best_val_iou.json

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
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