fix(networking): drop shoukei static address

shoukei is a laptop using DHCP and never consumes hostsAddr.shoukei.
Its 192.168.5.108 collided with k3s-prod-1-master-1 and produced a wrong
ssh Host shoukei entry.

hosts/12kingdoms-shoukei/README.md

@@ -2,6 +2,9 @@
 
 This is NixOS's configuration for my Macbook Pro 2022 M2, 16G RAM.
 
+This laptop joins untrusted networks and uses DHCP instead of a static IP, so it has no entry in
+`vars/networking.nix`.
+
 Related:
 
 - [M2 Series Feature Support - Asahi Linux](https://asahilinux.org/docs/platform/feature-support/m2/)

vars/networking.nix

@@ -84,13 +84,6 @@ rec {
       iface = "end1";
       ipv4 = "192.168.5.107";
     };
-    shoukei = {
-      # Apple M2 + NixOS
-      # Used only when at home
-      iface = "wlan0";
-      ipv4 = "192.168.5.108";
-      ipv6 = "fe80::11"; # Link-local Address
-    };
     rakushun = {
       # Orange Pi 5 - ARM
       # RJ45 port 1 - enP4p65s0