Add go server

server/go.mod

@@ -0,0 +1,3 @@
+module git.chandlerswift.com/chandlerswift/digital-turntable/server
+
+go 1.25.5

server/main.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"embed"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+)
+
+//go:embed dist
+var webUI embed.FS
+
+func setReader(state string) error {
+	// echo 'on' > '/sys/bus/usb/devices/1-1/power/control'  # or 'auto'
+	switch state {
+	case "auto", "on":
+		return os.WriteFile("/sys/bus/usb/devices/1-1/power/control", []byte(state), 0)
+	default:
+		return fmt.Errorf("unknown state %q", state)
+	}
+}
+
+func main() {
+	setReader("on")
+	http.Handle("/", http.FileServerFS(webUI))
+
+	http.HandleFunc("POST /api/reader/{state}", func(w http.ResponseWriter, r *http.Request) {
+		if err := setReader(r.PathValue("state")); err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		w.Write([]byte("ok"))
+	})
+
+	log.Fatal(http.ListenAndServe("127.0.0.1:8000", nil))
+}