Fix frontend path for esbuild bundle location

Co-Authored-By: Claude <noreply@anthropic.com>

trigo-web/backend/src/server.ts

@@ -69,7 +69,8 @@ app.use(express.json());
 
 // Serve static files from frontend build (for production)
 if (process.env.NODE_ENV === "production") {
-	const frontendPath = path.join(__dirname, "../../../../app/dist");
+	// With esbuild bundle at backend/dist/server.js, go up 2 levels then into app/dist
+	const frontendPath = path.join(__dirname, "../../app/dist");
 	app.use(express.static(frontendPath));
 
 	// Serve index.html for all routes (SPA support)