cost & pricing issue

[deehw]

Factory pricing counts uploaded CAD/evidence formats as physical parts. False Lantern had six parts but Factory counted 28 files, producing $161.99. The backend must use its existing printable-STL inventory; Workshop should not invent a price.

[vinkent-dev]

The auto-pricer was counting every mesh-ish file in the project tree as a part — cad/*.step, the *.gcode.3mf slicer evidence, even the .glb render. False Lantern's tree has 28 of those against its 6 printable STLs, hence $161.99.

Fixed: pricing now counts the same printable-STL inventory the slicer measures (stl only, *_parts/ wins over the roll-up, _NOT_PRINTED dropped) — 6 parts, and I re-listed False Lantern at $42.99, same SKU. Workshop already strips non-printable geometry from the handoff since 75e925d, so new publishes were covered from both sides anyway.