feat: rename masq to snat throughout, update generator to Shorewall 5 snat format

frontend/src/components/GenerateModal.tsx

@@ -18,7 +18,7 @@ interface GeneratedFiles {
   interfaces: string
   policy: string
   rules: string
-  masq: string
+  snat: string
 }
 
 interface Props {
@@ -28,7 +28,7 @@ interface Props {
   onClose: () => void
 }
 
-const TABS = ['zones', 'interfaces', 'policy', 'rules', 'masq'] as const
+const TABS = ['zones', 'interfaces', 'policy', 'rules', 'snat'] as const
 
 export default function GenerateModal({ open, configId, configName, onClose }: Props) {
   const [tab, setTab] = useState(0)