Extract breadhelp to its own repo (git.breadway.dev/Breadway/breadhelp)

Mirrors the bos-settings extraction (664298b): a breadhelp release no
longer requires a v* tag on the whole bos monorepo, which was
indistinguishable from an actual BOS-version release tag. Source lives
at ~/Projects/breadhelp now, full history preserved via git-filter-repo.

Root Cargo.toml/Cargo.lock and .forgejo/workflows/package.yml removed
too — breadhelp was the sole workspace member and the sole thing that
workflow built.

.forgejo/workflows/package.yml

@@ -1,40 +0,0 @@
-name: Build and publish package
-
-on:
-  push:
-    tags: ['v*']
-
-jobs:
-  package:
-    runs-on: [self-hosted, hestia]
-    container:
-      image: archlinux:latest
-    steps:
-      # Note: no actions/checkout — the archlinux image has no Node, which JS
-      # actions require. Everything runs as shell steps and clones manually.
-      - name: Build and publish
-        env:
-          PUBLISH_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
-        run: |
-          set -euo pipefail
-          VERSION="${GITHUB_REF_NAME#v}"
-          pacman -Syu --noconfirm base-devel git rust cargo gtk4 glib2
-          useradd -m builder
-          git config --global --add safe.directory '*'
-          git clone --branch "${GITHUB_REF_NAME}" --depth 1 \
-            "https://git.breadway.dev/${GITHUB_REPOSITORY}.git" /home/builder/src
-          cd /home/builder/src
-          git archive --format=tar.gz --prefix="breadhelp-${VERSION}/" HEAD \
-            > packaging/arch/breadhelp/breadhelp-${VERSION}.tar.gz
-          SHA=$(sha256sum packaging/arch/breadhelp/breadhelp-${VERSION}.tar.gz | awk '{print $1}')
-          sed -i "s/^pkgver=.*/pkgver=${VERSION}/" packaging/arch/breadhelp/PKGBUILD
-          sed -i "s/^sha256sums=.*/sha256sums=('${SHA}')/" packaging/arch/breadhelp/PKGBUILD
-          chown -R builder:builder /home/builder/src
-          # --nocheck: packaging builds the artifact; tests belong in a CI job.
-          su builder -c "cd /home/builder/src/packaging/arch/breadhelp && makepkg -f --noconfirm --nocheck"
-          PKG=$(find /home/builder/src/packaging/arch/breadhelp -name '*.pkg.tar.zst' | head -1)
-          curl -fsS -X PUT \
-            -H "Authorization: token ${PUBLISH_TOKEN}" \
-            -H "Content-Type: application/octet-stream" \
-            --data-binary "@${PKG}" \
-            "https://git.breadway.dev/api/packages/Breadway/arch/os"