recipe-generator: Update to new template structure with install and live templates

- Replaced individual templates with unified 'install' (desktop, server, hypervisor) and 'live' (live-desktop, live-server) templates

- Added new modifiers: variant_type, hypervisor-type, desktop, initial-setup, virtualization

- Updated generate_recipe.py to handle new modifier structure with additive flags

- Updated recipes_manifest.yaml with new modifier structure

- Added missing fragment files and directories

fragments/shared/live/hypervisor.ks

@@ -1,10 +1,14 @@
-# Hypervisor package inclusion for live server
-
-%packages --exclude-weakdeps
+# Live desktop hypervisor configuration
 
+# Enable virtualization support in live environment
+%packages
 qemu-kvm
-libvirt
 libvirt-client
 virt-install
-
+%end
+
+%post --erroronfail
+# Setup libvirt for live environment
+mkdir -p /var/lib/libvirt
+systemctl enable libvirtd
 %end