refactor(nix): extract common system configs into reusable modules

Create 6 new NixOS modules to reduce duplication across system configs:
- hardware/wooting: Wooting keyboard udev rules and Bluetooth compat
- services/nginx-base: Common nginx server settings
- services/acme-base: ACME certificate defaults
- services/xremap: Key remapping with sensible defaults
- system/no-sleep: Disable sleep/suspend/hibernate targets
- system/kernel-tweaks: PM freeze timeout and zram configuration

Update system configuration files to use these new modules.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

systems/x86_64-linux/mx/default.nix

@@ -22,6 +22,8 @@
   services.tailscale.enable = true;
 
   metacfg = {
+    services.nginxBase.enable = true;
+    services.acmeBase.enable = true;
     emailOnFailure.enable = true;
     base.enable = true;
     nix.enable = true;
@@ -42,7 +44,6 @@
     dates = "04:00";
     operation = "switch";
     allowReboot = true;
-    #    flake = lib.mkForce "git+file:///var/lib/gitea/repositories/harald/nixcfg.git#mx";
     flake = lib.mkForce "/root/nixcfg/.#mx";
   };