Add dataset card for WorldSculpt dataset

This PR adds a dataset card for the WorldSculpt/UE-MeshyScene dataset, including metadata, task category, license, relevant links, and download instructions from the repository README.

README.md

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+---
+license: apache-2.0
+task_categories:
+- image-to-3d
+---
+
+# WorldSculpt Dataset
+
+This dataset accompanies the paper [WorldSculpt: Generating Compositional Worlds from Grounded Videos](https://huggingface.co/papers/2609.05416). It provides the **UE-MeshyScene** benchmark of densely cluttered scenes with hundreds of objects, per-object annotations, and ground-truth meshes, as well as additional Marble demo data for converting 3DGS worlds into compositional mesh scenes.
+
+- **Project page:** [https://alaya-lab.github.io/WorldSculpt/](https://alaya-lab.github.io/WorldSculpt/)
+- **Code:** [https://github.com/AlayaLab/WorldSculpt](https://github.com/AlayaLab/WorldSculpt)
+
+## Download
+
+The dataset can be downloaded with the Hugging Face CLI as described in the [GitHub README](https://github.com/AlayaLab/WorldSculpt):
+
+```bash
+# UE-MeshyScene
+hf download AlayaLab/WorldSculpt_data --include "UE-MeshyScene/*" --local-dir ./input --repo-type=dataset
+cd ./input/UE-MeshyScene
+tar xvf scene*.tar
+cd ../..
+
+# Marble DEMO data
+hf download AlayaLab/WorldSculpt_data --include "Marble/*" --local-dir ./input --repo-type=dataset
+cd ./input/Marble
+tar xvf Marble.tar.gz
+cd ../..
+```
+
+## License
+
+Apache 2.0