feat(build): inject the AUR repo into the profile and live ISO

Wire build-aur.sh into build.sh. After the pacoloco block, build the AUR repo and append a build-host [aur] stanza to profile/pacman.conf with an absolute file:// Server, so mkarchiso installs the baked packages into airootfs. The stanza lands after the pacoloco rewrite so its file:// path isn't redirected to localhost.

Add the audited official extra packages and the baked AUR names to packages.x86_64, both sourced from build-aur.sh so the list never drifts from the build array. Ship the repo into airootfs and write a complete live /etc/pacman.conf: the pristine releng config with [aur] appended, not an [aur]-only file, since this replaces the live system's stock config and an AUR-only one would strip the official repos. Copy the manifest beside the ISO in out/.

--skip-aur skips the build, the stanza, the AUR names, and the live config. The three injection points also guard on the repo dir existing, so the documented empty-set path can't point mkarchiso at a missing repo. Moved BUILD_LOG creation ahead of the AUR build so its output is captured too.

A unit test reproduces the live-config construction and asserts core, extra, the mirrorlist, and [aur] all survive. The end-to-end proof that mkarchiso installs from the build-host repo needs a real root build and is tracked as manual verification.

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