switch to go backend

Backend/main.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"os"
+	"path/filepath"
+)
+
+func main() {
+	publicDir := "./public"
+	spaIndex := filepath.Join(publicDir, "app", "index.html")
+
+	fs := http.FileServer(http.Dir(publicDir))
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		// Try to serve the static file
+		path := filepath.Join(publicDir, filepath.Clean(r.URL.Path))
+		if info, err := os.Stat(path); err == nil && !info.IsDir() {
+			fs.ServeHTTP(w, r)
+			return
+		}
+
+		// Fall back to SPA index for client-side routing
+		http.ServeFile(w, r, spaIndex)
+	})
+
+	addr := ":8080"
+	log.Printf("Listening on %s", addr)
+	log.Fatal(http.ListenAndServe(addr, nil))
+}