Adds --info-mesh-storage-budget and --info-project-models-total
to the existing cli_mesh_info module so all 5 mesh-aggregate
info handlers live together. The first computes per-category
byte breakdowns for a single WOM (positions / normals / UVs /
indices / bones / animations); the second walks every zone in
a project for an aggregate WOM/WOB rollup with per-zone rows.
main.cpp shrinks by 250 lines (1,437 to 1,187). All five
handlers preserve --json output for capacity-planning pipelines.
Moves three mesh-aggregate info handlers (--info-zone-models-total,
--list-zone-meshes-detail, --info-mesh) out of main.cpp into a
new cli_mesh_info.{hpp,cpp} module. The first aggregates
WOM/WOB stats across a zone; the second tabulates per-mesh
metrics sorted by triangle count; the third dumps single-WOM
detail (bounds, version, batches, bones, animations, textures).
main.cpp shrinks by 285 lines (1,826 to 1,541). All three
preserve --json output for capacity-planning pipelines.
