This PR enhances the model card for `DeltaFlow` by:
- Adding the `pipeline_tag: robotics` to improve discoverability on the Hugging Face Hub's task filters.
- Updating the link to the paper with the official Hugging Face paper page: [DeltaFlow: An Efficient Multi-frame Scene Flow Estimation Method](https://huggingface.co/papers/2508.17054).
- Including a direct link to the `DeltaFlow` GitHub repository (`https://github.com/Kin-Zhang/DeltaFlow`).
upload deltaflow ckpt with range inside 38m and resolution 0.15m