Previously, list modifiers like hardware-support, guest-agents, and hypervisor-type created multiple variants but overwrote the same filenames. Now:
1. Add '_hw' suffix when hardware-support is enabled
2. Add '_ga' suffix when guest-agents is enabled
3. Add CPU type (amdcpu, intelcpu) suffix for hypervisor variants
4. Normalize modifier names from hypervisor-type to hypervisor_type
This ensures all 144 recipes have unique filenames.
