fix: wireguard config file permission issue

system/dev/dn-lap/default.nix

@@ -3,16 +3,13 @@
   system,
   inputs,
   nix-version,
+  git-config,
+  username,
   ...
 }:
 
 let
   cursor-size = "24";
-  username = "danny";
-  git-config = {
-    username = "DACHXY";
-    email = "danny10132024@gmail.com";
-  };
 in
 {
   imports = [

system/dev/dn-pre7780/default.nix

@@ -3,16 +3,13 @@
   inputs,
   system,
   nix-version,
+  git-config,
+  username,
   ...
 }:
 
 let
   cursor-size = "32";
-  username = "danny";
-  git-config = {
-    username = "DACHXY";
-    email = "danny10132024@gmail.com";
-  };
 in
 {
   imports = [

system/modules/wireguard.nix

@@ -1,16 +1,12 @@
-{ ... }:
+{ lib, ... }:
 let
   configPath = "/etc/wireguard/wg0.conf";
 in
 {
-  networking.firewall = {
-    allowedUDPPorts = [ 51820 ];
+  networking = {
+    firewall = {
+      allowedUDPPorts = [ 51820 ];
+    };
+    wg-quick.interfaces.wg0.configFile = configPath;
   };
-  networking.wg-quick.interfaces.wg0 =
-    if builtins.pathExists configPath then
-      {
-        configFile = configPath;
-      }
-    else
-      { };
 }