refactor: split configurations for fail2ban, postgres, and qbittorent into folders

modules/nixos-modules/server/qbittorent/qbittorent.nix

@@ -0,0 +1,18 @@
+{
+  lib,
+  config,
+  ...
+}: {
+  options.services.qbittorrent = {
+    mediaDir = lib.mkOption {
+      type = lib.types.path;
+      description = lib.mdDoc ''
+        The directory to create to store qbittorrent media.
+      '';
+    };
+  };
+
+  config = lib.mkIf config.services.qbittorrent.enable {
+    # Main qbittorrent configuration goes here if needed
+  };
+}