chore(model gallery): add shuttleai_shuttle-3.5

[mudler]

Description

This pull request adds a new entry for the Shuttle 3.5 model to the gallery/index.yaml file. The entry includes metadata, descriptions, and file details for the model.

Additions to the model gallery:

• Added a new model entry for shuttleai_shuttle-3.5:
  • Includes metadata such as name, icon URL, and feature descriptions.
  • Highlights the model's capabilities, including reasoning enhancements, multilingual support, and agent-based task expertise.
  • Provides detailed specifications, such as parameter counts, context length, and training stages.
  • Lists associated files with SHA-256 checksums and Hugging Face URIs.

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

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