qt5-datavis3d

• Path: arch/maintained/qt5-datavis3d (new – vendored from AUR 2026-08-02 to unblock python-pyqt5-datavisualization)
• 2026-08-02: added as a submodule from AUR (https://aur.archlinux.org/qt5-datavis3d.git, https since AUR’s git-ssh endpoint was down for maintenance). Built+published cleanly (5.15.18-2, + qt5-datavis3d-debug), x86_64.