feat(gallery): add mxbai embed large variants

Add Q4_K_M and Q8_0 llama.cpp builds plus the official F16 GGUF for Mixedbread mxbai-embed-large-v1.

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