Add pipeline tag

This PR adds the `text-to-video` pipeline tag to the model card metadata, ensuring the model is correctly categorized and easier to find on the Hugging Face Hub.

README.md

@@ -1,8 +1,10 @@
 ---
-license: cc-by-nc-4.0
 base_model:
 - Wan-AI/Wan2.2-I2V-A14B
+license: cc-by-nc-4.0
+pipeline_tag: text-to-video
 ---
+
 <p align="center">
   <h2 align="center"><i>StoryMem</i>: Multi-shot Long Video Storytelling with Memory</h1>
   <!-- <h3 align="center">ICCV 2025</h3> -->