Implement r5500 media stack configuration with NFS and Docker services

- Added configuration for media stack on r5500, including paths for Jellyfin, Sonarr, Radarr, and other media services.
- Integrated NFS client for accessing Jellyfin libraries from nixdesk.
- Established Docker services for Dispatcharr and Organizr, including necessary user and group setups.
- Created systemd services for managing media directories and ensuring proper permissions.

modules/hosts/r5500/_services/dispatcharr.nix

@@ -0,0 +1,34 @@
+{ lib, pkgs, mediaStackPaths, ... }:
+let
+  dataDir = mediaStackPaths.dispatcharrDataDir;
+in
+{
+  systemd.tmpfiles.settings."r5500-dispatcharr-data" = {
+    "${dataDir}"."d" = {
+      mode = "0777";
+      user = "root";
+      group = "root";
+    };
+  };
+
+  systemd.services.docker-dispatcharr.preStart = lib.mkBefore ''
+    ${pkgs.coreutils}/bin/mkdir -p ${dataDir}
+  '';
+
+  virtualisation.oci-containers.containers.dispatcharr = {
+    image = "ghcr.io/dispatcharr/dispatcharr:latest";
+    ports = [ "9191:9191" ];
+    volumes = [
+      "${dataDir}:/data"
+    ];
+    environment = {
+      DISPATCHARR_ENV = "aio";
+      REDIS_HOST = "localhost";
+      CELERY_BROKER_URL = "redis://localhost:6379/0";
+      DISPATCHARR_LOG_LEVEL = "info";
+      TZ = "America/Moncton";
+    };
+  };
+
+  networking.firewall.allowedTCPPorts = [ 9191 ];
+}