This PR improves the model card by:
- Updating the `pipeline_tag` to `image-segmentation` to better reflect the model's purpose.
- Adding a link to the research paper: [Primus: Enforcing Attention Usage for 3D Medical Image Segmentation](https://huggingface.co/papers/2503.01835).
- Including the full author list and updating the citations.
- Linking to the official GitHub repository for the `nnUNet` framework.
- Clarifying that this specific checkpoint uses the Primus-M backbone pre-trained via VolumeFusion.