feat(archsetup): clone dotfiles repo and stow per DESKTOP_ENV

Dotfiles now live in their own repo (git.cjennings.net/dotfiles.git), so archsetup clones DOTFILES_REPO to the user's ~/.dotfiles and stows the right tree for the chosen DESKTOP_ENV: dwm and hyprland get common/ plus their own layer, none gets the standalone minimal/ tree. The clone runs as the target user, so the working tree is user-owned with no chown-after race.

Add DOTFILES_REPO / DOTFILES_BRANCH / DOTFILES_DIR config keys with the same injection guard the other repo keys carry. If the clone doesn't produce a git checkout, error_fatal stops the install rather than silently skipping the restore step that reverts what stow --adopt pulled in. That restore now runs for every DESKTOP_ENV, including none — minimal/ ships the .bashrc/.bash_profile that collide with /etc/skel, so its --adopt needs the same cleanup.

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