Add archived dataset fetal-head-ultrasound to segmentation

fetal-head-ultrasound/manifest.json

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+{
+  "task": "segmentation",
+  "dataset_name": "fetal-head-ultrasound",
+  "source_dir": "/vast/users/muhammad.haris/Sathira/Med-OneThinker-R1/datasets/segmentation/fetal-head-ultrasound",
+  "created_at": "2026-03-19 04:39:04",
+  "compression": "none",
+  "shard_size_bytes": 4294967296,
+  "n_files": 3424,
+  "n_shards": 1,
+  "total_bytes": 180684636
+}

fetal-head-ultrasound/part-00000.tar

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+version https://git-lfs.github.com/spec/v1
+oid sha256:a21c8ec07079f3e6a646b3de3fd4dc9c07bfc27c250cf8c1d984855addc735c2
+size 186849280