feat(dllm): default gallery entry on Q4_K_M; add Q8_0 variant

Q4_K_M (~17 GB, GB10-validated: cosine 0.9862, coherent generation) is
the friendlier default download than the 50 GB BF16; Q8_0 (~27 GB) is
the higher-fidelity middle ground. Both descriptions carry the measured
caveat that BF16 is ~5x faster per denoise step on BF16-native hardware,
with a pointer to fetch it manually when it fits. sha256 values are the
HF LFS oids.

Assisted-by: Claude Code (Fable 5)
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
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