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Default-deny inbound, allow outbound. Scoped to 'inet filter' with
'destroy table' on reload so podman/netavark tables are preserved.
- meta/base.txt: add nftables
- systemd-units/system/base.txt: enable nftables.service
- etc/nftables.conf: laptop ruleset (loopback, ct state, ICMP/ICMPv6
essentials, DHCPv6 client, default-drop input/forward, accept output)
- etc/sysctl.d/99-sysctl.conf: rp_filter=2, no redirects, no source-route,
log_martians
- README.md: firewall section with reload caveat
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