Add bambustudio-bin, Bambu Studio, to the fast ring

Bambu Studio is the official slicer for Bambu Lab printers. Linux builds
are GitHub AppImages with a changing timestamp in the filename, so this
tracks the AUR bambustudio-bin package that already resolves those
assets, and puts it on the fast ring so stable users get updates with
omarchy update.

Two small Omarchy patches: skip stripping the extracted AppImage, and
clear the AppImage ELF magic byte so --appimage-extract works in the
build container. The desktop entry is labeled Bambu Studio and grouped
under Graphics.

Validation: bin/add-package + bin/sync-aur reapply the patches; AUR +
.omarchy reproduces the checked-in tree. Built and launched the 2.8.2.61
AppImage on Omarchy 4.0.3 (x86_64); bambu-studio --help reports
BambuStudio-02.08.02.61. AUR is currently 02.08.02.60; the next AUR bump
will sync through.

pkgbuilds/bambustudio-bin/bambu-studio

@@ -0,0 +1,2 @@
+#!/bin/bash
+exec "/opt/bambustudio-bin/AppRun" "$@"