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/nix-server/_services/dispatcharr.nix

@@ -9,7 +9,9 @@
 {
   systemd.tmpfiles.settings."nix-server-dispatcharr-data" = {
     "/var/lib/dispatcharr"."d" = {
-      mode = "0755";
+      # Dispatcharr runs as a non-root user inside the container; keep /data writable.
+      # (Plugins like EPG Janitor write to `/data/*.json`.)
+      mode = "0777";
       user = "root";
       group = "root";
     };