Distinguish same-version quantized models (e.g. GGUF Q4_K_M vs Q8_0) on
cards, which previously showed only the identical CivitAI version name.
Detection is content-based and stored as a three-state sidecar field
(absent = unchecked, "" = checked-unavailable, value = canonical name),
mirroring the autov3 pipeline:
- GGUF: minimal pure-struct header parser reads general.file_type
- safetensors: dominant tensor dtype F8_* -> FP8
- CivitAI files[].metadata.fp == "fp8" fills in as a fallback only
- A one-time backfill service covers existing libraries; each file
costs only a few-hundred-byte header read
The footer renders the badge after the version name (suppressed in
grouped mode), gated by a new show_quantization_on_card setting that
follows the show_version_on_card toggle pattern.
