refactor: moved nixos modules to dendrite pattern

modules/nixos/programs/qbittorent/qbittorent.nix

@@ -0,0 +1,20 @@
+{...}: {
+  flake.nixosModules.qbittorent-service = {
+    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
+    };
+  };
+}