fix(firewall): NAT-Regeln nach Priorität sortieren + Port-Range-Validierung (v1.1.137)

- dataSource: data→sortedNAT — Up/Down-Pfeile zeigten auf falschen Nachbarn
- Form.Item dependencies: dportEnd/targetPortEnd validiert ≥ Start-Port
- Modal destroyOnHidden: Formular-State nach Schließen zurückgesetzt

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

management-ui/src/i18n/locales/en/common.json

@@ -142,6 +142,7 @@
       "matchSrcCidr": "Source CIDR (match)", "matchDstCidr": "Dest. CIDR (match)",
       "matchDstCidrHint": "empty = any dest IP (e.g. box's public IP)",
       "dportStart": "Port (start)", "dportEnd": "Port (end)",
+      "portRangeError": "End port must be ≥ start port",
       "targetAddr": "Target address", "targetPortStart": "Target port (start)", "targetPortEnd": "Target port (end)",
       "comment": "Comment",
       "add": "Add NAT rule", "edit": "Edit NAT rule",