Add decision-model tag

Hi fastino team,

This PR adds the `decision-model` tag to the model card metadata. GLiNER2.5-multi-Decide scores labels passed at call time in a single forward pass, the kind of model the Hub groups under this tag, so it shows up next to the other decision models: https://huggingface.co/models?other=decision-model

<img src="https://cdn-uploads.huggingface.co/production/uploads/noauth/gKtmJfAU6e4uyiBQRFjU7.png" alt="decision-model tag" width="500">

It's a one-line metadata change, nothing else in the card is touched.

README.md

@@ -12,6 +12,7 @@ tags:
 - Sentiment Analysis
 - Topic classification
 - Named Entity Recognition
+- decision-model
 base_model: fastino/gliner2.5-multi-v1
 ---
 <div align="center">