chore(model gallery): add microsoft_phi-4-reasoning

[mudler]

Description

This pull request updates the gallery/index.yaml file to add a new model entry for "microsoft_phi-4-reasoning." The change includes metadata and configuration details for the model.

Addition of a new model entry:

• Added a new entry for the "microsoft_phi-4-reasoning" model, including its name, description, URLs, and file details. The model is described as a state-of-the-art reasoning model fine-tuned using supervised learning and reinforcement learning, with a focus on advanced reasoning in math, science, and coding.

Notes for Reviewers

Signed commits

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