ParseSizeString accepted only SI suffixes, so a "20GiB" floor was rejected
outright. Model and VRAM sizes are conventionally quoted in IEC units, and
silently reading GiB as GB would understate a floor by about 7%.
Purely additive: these inputs previously returned an unknown-suffix error.
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>