Replace hardcoded msdos disklabel with firmware-aware configuration:
- UEFI systems now use GPT, allowing ESP creation for grub-install EFI
- BIOS systems continue using MBR/msdos where core.img fits in post-MBR space
This fixes the bug where forcing msdos on UEFI prevented ESP creation,
resulting in non-bootable installations. The disklabel is now dynamically
generated by a %pre script that detects firmware type and writes the
appropriate clearpart command to /tmp/fws-clearpart.ks for inclusion.
Clarifies that clearpart --all only affects GUI-selected disks, addressing
multi-disk scenarios where users may not want all disks wiped.
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