feat(gallery): add Laguna S APEX variants

The new importance-matrix builds reduce Laguna S 2.1 from the existing 96 GB default to 73.9 GB or 54.4 GB. Add both as selectable llama.cpp variants.

Assisted-by: Codex:gpt-5
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
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