feat(shoukei): enable wluma ambient-light auto brightness

- read Asahi aop-sensors ALS via iio and drive eDP-1 backlight
- drop PrivateUsers for wluma so it can reach the real user D-Bus session
- remove hypridle 10min screen-dim listener: its brightnessctl writes fight
  wluma and get learned as manual adjustments

home/hosts/linux/12kingdoms-shoukei.nix

@@ -4,7 +4,10 @@ let
   mkSymlink = config.lib.file.mkOutOfStoreSymlink;
 in
 {
-  imports = [ ../../linux/gui.nix ];
+  imports = [
+    ../../linux/gui.nix
+    ./12kingdoms-shoukei/wluma.nix
+  ];
 
   programs.ssh.settings."github.com".IdentityFile = "${config.home.homeDirectory}/.ssh/${hostName}";