harden and fix: nftables input chain, sudo, agenix, ZFS, NAT priority ...

- Add inet input_filter table to xlab-gateway (policy drop on WAN)
- Restrict NOPASSWD sudo to ldx only; ylw uses password sudo via wheel
- Restructure secrets.nix with admins list, prepare for ylw ed25519 key
- Add ye-lw21 to trusted-users in common.nix
- Remove contradictory relatime=on when atime=off on rpool
- Fix NAT postrouting priority: filter → srcnat
- Remove duplicate nixpkgs.hostPlatform from xlab-gateway hardware-configuration

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

xlab-gateway: add hardware-configuration.nix, disable wait-online ...

- Import generated hardware-configuration.nix (Intel CPU microcode,
  boot modules for ehci_pci, ahci, nvme, kvm-intel)
- Disable systemd-networkd-wait-online (gateway doesn't need to block
  boot waiting for WireGuard interfaces)

Co-Authored-By: Claude Opus 4.6 <[email protected]>