Update pipeline tag to any-to-any

This PR updates the `pipeline_tag` to `any-to-any` in the model card's metadata. This change more accurately reflects the model's unified capabilities, including image understanding, generation, and editing, as described in its accompanying paper. This also ensures the model is discoverable under the `any-to-any` pipeline on the Hugging Face Hub (e.g., via https://huggingface.co/models?pipeline_tag=any-to-any).

README.md

@@ -1,7 +1,7 @@
 ---
-license: apache-2.0
 library_name: transformers
-pipeline_tag: image-to-image
+license: apache-2.0
+pipeline_tag: any-to-any
 frameworks:
 - Pytorch
 tasks:
@@ -82,5 +82,4 @@ Feel free to reference our work if you find it helpful.
       primaryClass={cs.CV},
       url={https://arxiv.org/abs/2504.21356v2}, 
 }
-```
-
+```