chore: add env template for production deployment

.env.production.example

@@ -0,0 +1,18 @@
+# -------------------------------------------------------------
+# BackOne Deep Package Inspection - Secure Production Env
+# -------------------------------------------------------------
+# The frontend Next.js rewrite will proxy /api to this URL.
+# Since frontend and backend are in the same Docker network,
+# we can use the internal hostname 'backend' and internal port 3001.
+NEXT_PUBLIC_API_URL=http://backend:3001
+
+# The backend port must match what the container runs on
+BACKEND_PORT=3001
+
+# Allowed origins should be the actual domain where it will be hosted
+# Change 'demoplace.com' to your actual domain
+ALLOWED_ORIGINS=http://demoplace.com,https://demoplace.com
+
+# Standard security tokens (Change these before deploying to prod!)
+JWT_SECRET=super_secret_production_key_123!
+NETIFY_API_KEY=your_netify_api_key_here