feat(firewall): Regel duplizieren + CIDR-Validierung (v1.1.139)

- Duplicate-Button (CopyOutlined): klont Regel mit priority+1, disabled=true, Name "(copy)"
- CIDR-Felder: Pattern-Validator für IPv4/IPv6-CIDR-Notation
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -109,6 +109,9 @@
       "cidr": "CIDR",
       "actions": { "accept": "ACCEPT", "drop": "DROP", "reject": "REJECT" },
       "kinds": { "any": "Beliebig", "object": "Objekt", "group": "Gruppe", "cidr": "CIDR" },
+      "duplicate": "Regel duplizieren",
+      "duplicated": "Regel dupliziert (deaktiviert, Priorität +1).",
+      "cidrInvalid": "Gültiges CIDR eingeben (z.B. 10.0.0.0/24)",
       "moveUp": "Nach oben (höhere Priorität)",
       "moveDown": "Nach unten (niedrigere Priorität)",
       "emptyTitle": "Noch keine eigenen Firewall-Regeln.",

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

@@ -109,6 +109,9 @@
       "cidr": "CIDR",
       "actions": { "accept": "ACCEPT", "drop": "DROP", "reject": "REJECT" },
       "kinds": { "any": "Any", "object": "Object", "group": "Group", "cidr": "CIDR" },
+      "duplicate": "Duplicate rule",
+      "duplicated": "Rule duplicated (disabled, priority +1).",
+      "cidrInvalid": "Enter a valid CIDR (e.g. 10.0.0.0/24)",
       "moveUp": "Move up (higher priority)",
       "moveDown": "Move down (lower priority)",
       "emptyTitle": "No custom firewall rules yet.",