This PR improves the model card for **LongE2V** by:
- Adding the `image-to-video` pipeline tag to the metadata so it can be easily discovered.
- Linking the model card to the paper [LongE2V: Long-Horizon Event-based Video Reconstruction, Prediction, and Frame Interpolation with Video Diffusion Models](https://huggingface.co/papers/2607.08770).
- Providing direct links to the official [Project Page](https://cdfan0627.github.io/LongE2V-page/) and [GitHub Repository](https://github.com/cdfan0627/LongE2V).
Update README: link to LongE2V-data dataset and usage instructions
