cmd/mbf: integrate pkgserver into command info

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/mbf/internal/pkgserver/ui/ui.go

@@ -0,0 +1,9 @@
+// Package ui holds the static web UI.
+package ui
+
+import "net/http"
+
+// Register arranges for mux to serve the embedded frontend.
+func Register(mux *http.ServeMux) {
+	mux.Handle("GET /", http.FileServer(http.FS(static)))
+}