Serving Static Files

// Serve files from the 'public' directory
app.use(express.static("public"));
// GET /logo.png → serves public/logo.png
// GET /css/style.css → serves public/css/style.css
// GET / → serves public/index.html (if it exists)

// Mount at a virtual path prefix
app.use("/assets", express.static("public"));
// GET /assets/logo.png → serves public/logo.png

// Serve a React build
app.use(express.static(path.join(__dirname, "../client/build")));

// Catch-all for SPA routing (client-side routing)
app.get("*", (req, res) => {
  res.sendFile(path.join(__dirname, "../client/build/index.html"));
});