feat: ISO size reduction, user account, SDDM, PAM, VirtIO fixes, KDE/Qt patches

- Trim redbear-firmware from 1816MB to 143MB (GPU+WiFi only)
- Reduce filesystem_size from 8192 to 2048 MB
- Add unprivileged user account (uid=1000, sudo group)
- Add SDDM display manager recipe with Wayland-only patches
- Add pam-redbear PAM module for authentication
- Fix VirtIO queue timeout (SeqCst fence, remove permanent failure)
- KDE/KWin build fixes (libinput, wayland socket, ramfile, tabletmode)
- Qt6 build fixes (platformdefs, socket engine, Wayland integration)
- KF6 CMake fixes (attica, kcmutils, kcolorscheme, kcompletion, etc.)
- libxml2 build fix, libxkbcommon recipe fix
- Remove gcc-native/binutils-native from desktop ISO

scripts/run_full.sh

@@ -23,6 +23,7 @@ exec qemu-system-x86_64 \
     -m "${RAM}" \
     -drive if=pflash,format=raw,readonly=on,file="$BIOS" \
     -drive file="$IMAGE",format=raw \
-    -device virtio-gpu-pci \
+    -device virtio-gpu-gl \
+    -display gtk,gl=on \
     -enable-kvm \
     -serial mon:stdio