Viktor Liu 2f5d9fc0cd Add IPv6 dispatch for OutputDNAT, fix v6 guard pattern, rename DNAT params ...

- Add IPv6 router dispatch to AddOutputDNAT/RemoveOutputDNAT in both
  nftables and iptables managers (was hardcoded to v4 router only).
- Fix all DNAT and AddDNATRule dispatch methods to check Is6() first,
  then error with ErrIPv6NotInitialized if v6 components are missing.
  Previously the hasIPv6() && Is6() pattern silently fell through to
  the v4 router for v6 addresses when v6 was not initialized.
- Add ErrIPv6NotInitialized sentinel error, replace all ad-hoc
  "IPv6 not initialized" format strings across both managers.
- Rename sourcePort/targetPort to originalPort/translatedPort in all
  DNAT method signatures to reflect actual DNAT semantics.
- Remove stale "localAddr must be IPv4" comments from interface.

2026-04-10 12:32:41 +02:00

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