feat: Enhance Dockerfile with verification for standalone output and update n8n status route to handle missing webhook URL

app/api/n8n/status/route.ts

@@ -6,10 +6,23 @@ export const revalidate = 30;
 
 export async function GET() {
   try {
+    // Check if n8n webhook URL is configured
+    const n8nWebhookUrl = process.env.N8N_WEBHOOK_URL;
+    
+    if (!n8nWebhookUrl) {
+      // Return fallback if n8n is not configured
+      return NextResponse.json({
+        status: { text: "offline", color: "gray" },
+        music: null,
+        gaming: null,
+        coding: null,
+      });
+    }
+
     // Rufe den n8n Webhook auf
     // Add timestamp to query to bypass Cloudflare cache
     const res = await fetch(
-      `${process.env.N8N_WEBHOOK_URL}/webhook/denshooter-71242/status?t=${Date.now()}`,
+      `${n8nWebhookUrl}/webhook/denshooter-71242/status?t=${Date.now()}`,
       {
         method: "GET",
         headers: {