fix: Add n8n environment variables to production deployment

- Add N8N_WEBHOOK_URL, N8N_SECRET_TOKEN, N8N_API_KEY to docker-compose.production.yml
- Export environment variables in workflow before docker-compose up
- Improve error logging in chat API for better debugging
- Add better error handling in ChatWidget component
- Create setup guide for n8n chat configuration

app/components/ChatWidget.tsx

@@ -129,10 +129,21 @@ export default function ChatWidget() {
       });
 
       if (!response.ok) {
-        throw new Error("Failed to get response");
+        const errorText = await response.text().catch(() => 'Unknown error');
+        console.error("Chat API error:", {
+          status: response.status,
+          statusText: response.statusText,
+          error: errorText,
+        });
+        throw new Error(`Failed to get response: ${response.status} - ${errorText.substring(0, 100)}`);
       }
 
       const data = await response.json();
+      
+      // Log response for debugging (only in development)
+      if (process.env.NODE_ENV === 'development') {
+        console.log("Chat API response:", data);
+      }
 
       // Decode HTML entities in the reply
       let replyText = data.reply || "Sorry, I couldn't process that. Please try again.";