Add packaging/arch PKGBUILD and Forgejo Actions workflows

- packaging/arch/PKGBUILD: builds and publishes breadpad to [breadway] repo
- .forgejo/workflows/mirror.yml: mirrors every push/tag to GitHub
- .forgejo/workflows/package.yml: builds on tag, publishes to Forgejo registry

Requires FORGEJO_TOKEN and GITHUB_MIRROR_TOKEN secrets in Forgejo.

packaging/arch/PKGBUILD

@@ -0,0 +1,34 @@
+# Maintainer: Breadway <rileyhorsham@gmail.com>
+
+pkgname=breadpad
+pkgver=0.3.1
+pkgrel=1
+pkgdesc="Quick-capture scratchpad and note viewer with AI classification"
+arch=('x86_64')
+url="https://github.com/Breadway/breadpad"
+license=('MIT')
+depends=('gtk4' 'gtk4-layer-shell')
+optdepends=(
+  'ollama: local AI note classification'
+  'hyprland: scratchpad window integration'
+)
+makedepends=('rust' 'cargo')
+source=("${pkgname}-${pkgver}.tar.gz")
+sha256sums=('SKIP')
+
+build() {
+  cd "${srcdir}/${pkgname}-${pkgver}"
+  cargo build --release --locked
+}
+
+check() {
+  cd "${srcdir}/${pkgname}-${pkgver}"
+  cargo test --release --locked --workspace
+}
+
+package() {
+  cd "${srcdir}/${pkgname}-${pkgver}"
+  install -Dm755 target/release/breadpad "${pkgdir}/usr/bin/breadpad"
+  install -Dm755 target/release/breadman "${pkgdir}/usr/bin/breadman"
+  install -Dm644 LICENSE "${pkgdir}/usr/share/licenses/${pkgname}/LICENSE"
+}