feat: add qbit

hosts/common/optional/qbit.nix

@@ -1,11 +1,30 @@
 {...}: {
-  # Enable qBittorrent daemon
-  services.qbittorrent = {
-    enable = true;
-    dataDir = "/var/lib/qbittorrent";
-    user = "qbittorrent";
-    group = "qbittorrent";
-    port = 8080; # WebUI port
-    openFirewall = true; # Opens the WebUI port in firewall
+  virtualisation.oci-containers = {
+    backend = "docker"; # or "podman"
+    containers = {
+      qbittorrent = {
+        image = "lscr.io/linuxserver/qbittorrent:latest";
+        autoStart = true; # Equivalent to restart: unless-stopped
+
+        environment = {
+          PUID = "1000";
+          PGID = "1000";
+          TZ = "Etc/UTC";
+          WEBUI_PORT = "8080";
+          TORRENTING_PORT = "6881";
+        };
+
+        volumes = [
+          "/path/to/qbittorrent/appdata:/config"
+          "/nas/downloads:/downloads" # optional
+        ];
+
+        ports = [
+          "8080:8080" # WebUI
+          "6881:6881" # Torrenting TCP
+          "6881:6881/udp" # Torrenting UDP
+        ];
+      };
+    };
   };
 }