Add pipeline_tag and library_name to metadata

This PR improves the model card's metadata by adding `pipeline_tag: image-text-to-text` and `library_name: transformers`. This will make the model easier to discover on the Hugging Face Hub under the correct task category and enable the "Use in Transformers" button on the model page.

README.md

@@ -1,10 +1,13 @@
 ---
-license: apache-2.0
-language:
-- en
 base_model:
 - Qwen/Qwen3-VL-8B-Instruct
+language:
+- en
+license: apache-2.0
+library_name: transformers
+pipeline_tag: image-text-to-text
 ---
+
 <p align="center">
   <img src="assets/s_icon.png" width="48" alt="SingGuard icon">
 </p>