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>
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