fix: Remove demo pages and add testDataService for production build

app/api/health/route.ts

@@ -0,0 +1,17 @@
+/**
+ * Health check endpoint for Docker and Kubernetes
+ */
+import { NextResponse } from 'next/server';
+
+export async function GET() {
+  return NextResponse.json(
+    {
+      status: 'healthy',
+      timestamp: new Date().toISOString(),
+      service: 'btpxpress-frontend',
+      version: process.env.NEXT_PUBLIC_APP_VERSION || '1.0.0',
+    },
+    { status: 200 }
+  );
+}
+