Fix RecoverParts transform order in public API

[VMF-HIBIKI]

This fixes the inverse transform order in public/coacd.cpp.

The public CoACD(...) path applies transforms in this order:

1. Normalize()
2. PCA() (optional)
3. Compute()

So recovery must happen in reverse order:

1. RevertPCA(rot)
2. Recover(bbox)

Before this change, public/coacd.cpp::RecoverParts(...) called:

meshes[i].Recover(bbox);
meshes[i].RevertPCA(rot);

That rotates the translation restored by Recover(), which can offset the final convex hulls relative to the original mesh when PCA is enabled.

This patch makes the public wrapper consistent with the existing internal implementation in src/model_obj.cpp, which already applies:

meshes[i].RevertPCA(rot);
meshes[i].Recover(bbox);

Change scope is intentionally minimal: one line moved, no behavior changes outside the PCA recovery path.