fix(installer): merge GRUB cmdline instead of overwriting it

configure_grub replaced the whole GRUB_CMDLINE_LINUX_DEFAULT line with a fixed string. A base install that had set cryptdevice=, resume=, zfs=, or any other boot-critical parameter lost it, and the grub-mkconfig that follows baked an unbootable config.

update_grub_cmdline now reads the current value and merges: every existing token survives, archsetup's tokens are added, and where both set the same key archsetup's value wins. A safety check refuses to write when any existing token's key would vanish from the merge, and the write goes through awk + mv so paths with slashes can't break the substitution. The block also backs up /etc/default/grub before editing, which the other system-file edits already did.

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