refactor: moved modules to legacy-modules

legacy-modules/nixos-modules/sync/sync.nix

@@ -0,0 +1,36 @@
+{
+  config,
+  lib,
+  syncthingConfiguration,
+  ...
+}: let
+  mountDir = "/mnt/sync";
+  configDir = "/etc/syncthing";
+in {
+  config = lib.mkMerge [
+    {
+      systemd = lib.mkIf config.services.syncthing.enable {
+        tmpfiles.rules = [
+          "A ${mountDir} -    -        -               - u:syncthing:rwX,g:syncthing:rwX,o::-"
+          "d ${mountDir} 2755 syncthing syncthing -"
+          "d ${config.services.syncthing.dataDir} 775 syncthing syncthing -"
+          "d ${config.services.syncthing.configDir} 755 syncthing syncthing -"
+        ];
+      };
+    }
+    (lib.mkIf config.services.syncthing.enable (lib.mkMerge [
+      {
+        services.syncthing = {
+          user = "syncthing";
+          group = "syncthing";
+          dataDir = "${mountDir}/default";
+          configDir = configDir;
+          overrideDevices = true;
+          overrideFolders = true;
+          configuration = syncthingConfiguration;
+          deviceName = config.networking.hostName;
+        };
+      }
+    ]))
+  ];
+}