fix(k8s): use net.SplitHostPort for lsof IPv6 parsing and preserve spec-declared ports

[smith-xyz]

• Replace hand-rolled strings.Split(":") lsof address parsing with net.SplitHostPort, fixing silent drops of IPv6 bracket-notation addresses like [::]:8443
• Include pod spec-declared ports in the host-network filter so ports owned by secondary containers (invisible to lsof due to PID namespace isolation) are not incorrectly dropped
• Extract ParseLsofOutput as a standalone testable function

Fixes: #63
Closes: #26

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