restructure system modules, add tp packages, prune utilities.

modules/system/base.nix

@@ -1,14 +1,30 @@
-{ hostname, timezone, ... }: {
+{ hostname, timezone, locale, ... }: {
   system.stateVersion = "24.11";
   imports = [
+    ./core/virtualization.nix
+    ./core/bootloader.nix
+    ./core/filesystem.nix
+    ./core/network.nix
+    ./core/kernel.nix
+    ./core/shell.nix
     ./misc/utilities.nix
     ./misc/nix-conf.nix
   ];
 
   networking.hostName = "${hostname}";
   time.timeZone = timezone;
+  i18n.defaultLocale = locale;
+  environment.localBinInPath = true;
+
+  security = {
+    sudo.configFile = ''
+      Defaults insults
+      Defaults passwd_tries = 5
+    '';
+  };
+
   services = {
     openssh.enable = true;
     tailscale.enable = true;
   };
-}
+}