This PR enhances the model card by:
- Adding the `pipeline_tag: video-to-3d` to improve discoverability.
- Linking to the official paper: [Trace Anything: Representing Any Video in 4D via Trajectory Fields](https://huggingface.co/papers/2510.13802).
- Linking to the project page: [https://trace-anything.github.io/](https://trace-anything.github.io/).
- Linking to the GitHub repository: [https://github.com/ByteDance-Seed/TraceAnything](https://github.com/ByteDance-Seed/TraceAnything).
- Including a quick usage example directly from the GitHub repository.
