Add ping endpoint for server health verification

Added /ping endpoint to ensure server is responsive and help
debug connection issues. This provides a simple endpoint
to verify the server is running properly.

server/index.ts

@@ -170,6 +170,10 @@ app.use((req, res, next) => {
   // doesn't interfere with the other routes
   console.log(`Environment: NODE_ENV=${process.env.NODE_ENV}, app.get('env')=${app.get('env')}`);
   
+  // Add basic health endpoint before static serving to ensure server is responsive
+  app.get("/ping", (_req, res) => {
+    res.json({ status: "ok", timestamp: new Date().toISOString() });
+  });
   
   if (process.env.NODE_ENV === "development") {
     console.log("Setting up Vite development server");