refactor(packaging): split into dispatch/dispatch-systemd/dispatch-s6, separate dispatch-electron, add bun-based frontend serve

PKGBUILD is now a split package producing three .pkg.tar.zst files in one
makepkg run:
  - dispatch          base application files (/opt/dispatch), CLI wrappers
                       (dispatch-api, dispatch-frontend), env configs
                       (/etc/dispatch/dispatch-api.conf,
                        /etc/dispatch/dispatch-frontend.conf)
  - dispatch-systemd  systemd user units for dispatch-api + dispatch-frontend
                       (conflicts with dispatch-s6)
  - dispatch-s6       s6-rc service pipelines (-srv + -log) for both services
                       (conflicts with dispatch-systemd)

The Electron desktop wrapper moved to its own self-contained PKGBUILD at
packaging/electron/, producing dispatch-electron. It bundles its own copy of
the frontend dist + electron entry points under /opt/dispatch-electron and
does not depend on the base dispatch package, so users can install it
standalone and point VITE_API_URL at any backend at build time.

Files under packaging/ are now read directly from ${_projectdir}/packaging/
rather than via source=(); the two s6 service dirs share basenames (run,
type) which would collide inside ${srcdir}.

New frontend static server: packages/frontend/serve.ts uses Bun's built-in
HTTP server (no extra runtime deps) with SPA fallback to index.html and
path-traversal protection. PORT/HOST/DIST_DIR overridable via env. Exposed
as 'bun run --cwd packages/frontend serve' and via /usr/bin/dispatch-frontend.

Build scripts:
  - bin/build-pkg            now prints the freshest built packages
  - bin/install-pkg          installs dispatch + dispatch-systemd by default;
                              accepts package names or --all; searches both
                              packaging/ and packaging/electron/
  - bin/build-pkg-electron   new, builds the electron split
  - bin/build-pkg-windows    replaces bin/windows-pkg; drops the hard-coded
                              WSL copy step, just prints the win-unpacked path

.gitignore extended to cover packaging/*.tar.zst and packaging/electron/{src,pkg,*.pkg.tar.zst,*.tar.zst}.

1 files changed, 30 insertions, 0 deletions

diff --git a/packaging/dispatch-frontend-wrapper.sh b/packaging/dispatch-frontend-wrapper.sh
new file mode 100755
index 0000000..06aa9b0
--- /dev/null
+++ b/packaging/dispatch-frontend-wrapper.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+# dispatch-frontend-wrapper.sh
+# Wrapper script for running the Dispatch Frontend static-file server
+# outside of systemd / s6.
+# Install to /usr/bin/dispatch-frontend (chmod 755).
+#
+# Usage:
+#   dispatch-frontend          # runs the server, inheriting the current environment
+#   dispatch-frontend --help   # passes flags through to bun
+
+set -euo pipefail
+
+DISPATCH_CONF="/etc/dispatch/dispatch-frontend.conf"
+DISPATCH_DIR="/opt/dispatch"
+BUN="/usr/bin/bun"
+ENTRY_POINT="packages/frontend/serve.ts"
+
+# Source the environment file if it exists
+if [[ -f "$DISPATCH_CONF" ]]; then
+    set -o allexport
+    # shellcheck source=/etc/dispatch/dispatch-frontend.conf
+    source "$DISPATCH_CONF"
+    set +o allexport
+fi
+
+# Change to the application directory
+cd "$DISPATCH_DIR"
+
+# Hand off to bun — exec replaces this process so signals are forwarded correctly
+exec "$BUN" "$ENTRY_POINT" "$@"