fix(localrepo): Drop stale packages so update.sh can't re-add them

f06bfd1 and a940d91 removed eternalterminal-client/-server,
illogical-impulse-quickshell-git, meshy-git and pacserve from
packages.x86_64, but their .pkg.tar.zst files stayed in localrepo/ and
in local-aur.db. update.sh appends every localrepo package name back to
the list, which would bring the eternalterminal conflict back, and CI
shipped the conflicting packages into the image's /opt/localrepo.

Remove the files and their repo DB entries, re-sort the vulkan-* lines
in packages.x86_64, and drop the names from README.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -21,7 +21,6 @@ AlvinArch/
 ├── localrepo/
 │   ├── build-end4-deps.sh         # non-interactive AUR build (all deps)
 │   ├── end4-pkgbuilds/            # microtex-git, quickshell-git, bibata
-│   ├── illogical-impulse-quickshell-git-*.pkg.tar.zst
 │   ├── illogical-impulse-bibata-modern-classic-bin-*.pkg.tar.zst
 │   └── update.sh                  # existing, regenerates repo db
 └── packages.x86_64               # 420 packages (65+ end-4 deps added)
@@ -153,7 +152,7 @@ AlvinArch/
 │   ├── update.sh                    # Regenerates repo DB + syncs names to packages.x86_64
 │   ├── end4-pkgbuilds/             # PKGBUILDs: quickshell-git, microtex-git, bibata-modern-classic-bin
 │   ├── *.pkg.tar.zst               # Pre-built packages (illogical-impulse-*, wallust, grub-customizer,
-│   │                               #   snapd, upscayl, meshy-git, pacserve, etc.)
+│   │                               #   snapd, upscayl, eternalterminal, etc.)
 │   └── local-aur.db{,.tar.gz}      # Repo database files
 ├── efiboot/                         # UEFI boot (systemd-boot)
 │   └── loader/
@@ -286,7 +285,7 @@ Custom PKGBUILDs for end-4 metapackages:
 
 ### Pre-built Packages
 
-Packages like `illogical-impulse-quickshell-git`, `illogical-impulse-bibata-modern-classic-bin`, `wallust`, `grub-customizer`, `snapd`, `upscayl-bin`, `meshy-git`, `xwaylandvideobridge`, `pacserve`, etc.
+Packages like `illogical-impulse-bibata-modern-classic-bin`, `wallust`, `grub-customizer`, `snapd`, `upscayl-bin`, `xwaylandvideobridge`, `eternalterminal`, etc.
 
 ---