feat: included additional system components

Moved proxy declaration to specialisation
Enabled avahi
Enabled CUPS printing services

nixos/configuration.nix

@@ -37,10 +37,14 @@
     enable = true;
     powerOnBoot = true;
   };
+  specialisation = {
+    in-china.configuration = {
       networking.proxy = {
         default = "http://127.0.0.1:7897/";
         noProxy = "127.0.0.1,localhost,internal.domain";
       };
+    };
+  };
 
   systemd.user.services.mpris-proxy = {
     description = "Mpris proxy";

nixos/services/avahi.service.nix

@@ -0,0 +1,7 @@
+{...}: {
+  services.avahi = {
+    enable = true;
+    nssmdns = true;
+    openFirewall = true;
+  };
+}

nixos/services/laptop.preset.nix

@@ -4,5 +4,7 @@
     ./pipewire.service.nix
     ./syncthing.service.nix
     ./misc.service.nix
+    ./avahi.service.nix
+    ./printing.service.nix
   ];
 }

nixos/services/printing.service.nix

@@ -0,0 +1,6 @@
+{...}: {
+  services.printing = {
+    enable = true;
+    drivers = [];
+  };
+}