fix: rewrite netinstall and calamares launcher

- netinstall.conf: add required:true, file:// prefix, label config
- netinstall.yaml: flat group structure with proper DE package lists
- settings_online.conf: fix netinstall exec ordering
- calamares-next.sh: comprehensive yad-based launcher with logging
- PKGBUILD: pkgrel 9, yad as dependency

packages/calamares-branding-antergos-next/netinstall.conf

@@ -1,3 +1,7 @@
 ---
-groupsUrl: /etc/calamares/modules/netinstall.yaml
-operation: install
+groupsUrl:
+ - file:///etc/calamares/modules/netinstall.yaml
+required: true
+label:
+ sidebar: "Packages"
+ title: "Packages (select your desktop environment and additional packages)"