feat(gallery): add Security-SLM Gemma 4

Add the text-only Q4_K_M build for private red-team, blue-team, and security operations workloads. Configure the supported Gemma 4 model for llama.cpp with its verified Hugging Face checksum.

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