change from mono-home-manager to full flake multi-system configuration

modules/qbittorrent.nix

@@ -0,0 +1,21 @@
+{ config, pkgs, ... }:
+
+{
+  services.qbittorrent = {
+    enable = true;
+    user = "wieerwill";  # or a dedicated service user
+    group = "users";
+    webuiPort = 8080;
+    torrentingPort = 51413;
+    profileDir = "/var/lib/qbittorrent";
+    openFirewall = true;
+
+    serverConfig = {
+      Preferences = {
+        Connection.PortRangeMin = 51413;
+        Downloads.SavePath = "/home/wieerwill/torrents";
+        WebUI.Port = 8080;
+      };
+    };
+  };
+}