Add library_name to metadata

Hi! I'm Niels from the Hugging Face community team.

I've noticed that while your README contains a helpful code snippet using the `transformers` library, the `library_name` tag is missing from the metadata. I've added `library_name: transformers` to ensure the "Use in Transformers" button appears on the Hub, providing users with an automated code snippet to load your model.

I've also kept your existing metadata and content intact.

README.md

@@ -1,14 +1,15 @@
 ---
-license: apache-2.0
+base_model:
+- Qwen/Qwen3-4B-Instruct-2507
 language:
 - zh
 - en
+license: apache-2.0
 metrics:
 - accuracy
 - f1
-base_model:
-- Qwen/Qwen3-4B-Instruct-2507
 pipeline_tag: text-generation
+library_name: transformers
 ---
 
 # TCAndon-Router