feat(install): install baked AUR packages and clean the target config

Wire the baked AUR repo into the installer. Before pacstrap, install_base checks whether the ISO shipped the repo and, if so, exposes [aur] in the live /etc/pacman.conf and reads the package names from the manifest, adding them to the pacstrap set so they install into the target offline. This mirrors the existing [archzfs] handling. pacstrap resolves repos from the live system, not $MNTPOINT.

The live config already carries [aur] from the shipped ISO config, so the append is idempotent by design. A --skip-aur ISO ships no repo, and aur_repo_available gates the whole path, so the installer still works there.

configure_system strips any [aur] stanza from the target /etc/pacman.conf. pacstrap installs a stock target config with no [aur], so this is defensive, but it guarantees the installed system never references /usr/share/aur-packages, which exists only on the live ISO.

Four new common.sh helpers carry the logic: aur_repo_available, append_aur_repo (idempotent), aur_manifest_names (the manifest is the source of what to install, so the list never drifts), and strip_repo_stanza. All four covered across Normal, Boundary, and Error.

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