chore(model gallery): add gemma-3-12b-it-qat

[mudler]

Description

This pull request includes an update to the gallery/index.yaml file to add a new model entry for the Gemma 3 series. The most important change is the addition of the Gemma 3 12B instruction-tuned model with Quantization Aware Training (QAT).

New model entry:

• Added a new entry for the "gemma-3-12b-it-qat" model, which includes URLs, a description, and file details. This model is a 12B instruction-tuned version of the Gemma 3 model in GGUF format using QAT, which preserves similar quality as bfloat16 while reducing memory requirements.

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

[github-actions]

yamllint Failed

Show Output

::group::gallery/index.yaml
::warning file=gallery/index.yaml,line=21,col=6::21:6 [comments] missing starting space in comment
::warning file=gallery/index.yaml,line=39,col=6::39:6 [comments] missing starting space in comment
::warning file=gallery/index.yaml,line=57,col=6::57:6 [comments] missing starting space in comment
::error file=gallery/index.yaml,line=81,col=15::81:15 [anchors] found undeclared alias "llama3"
::warning file=gallery/index.yaml,line=2532,col=32::2532:32 [comments] too few spaces before comment
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::endgroup::

Workflow: Yamllint GitHub Actions, Action: __karancode_yamllint-github-action, Lint: gallery

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