Reorganize services/ into category subfolders

Group service modules by category (media, network, vpn, identity,
dev, desktop) to make the growing services/ dir easier to navigate.
containers.nix stays at the top level since it's a shared backend,
not a single-category service.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

hosts/jupiter/configuration.nix

@@ -7,20 +7,20 @@
     ./disk-config.nix          # disko: OS-disk partitions + filesystems
     ./secrets.nix              # sops-nix: samba password, tailscale key, ...
     ../../common.nix              # shared base: user / ssh / nix / firewall
-    ../../services/samba.nix
-    ../../services/avahi.nix
-    ../../services/audiobookshelf.nix
+    ../../services/network/samba.nix
+    ../../services/network/avahi.nix
+    ../../services/media/audiobookshelf.nix
     ../../services/containers.nix
-    ../../services/caddy.nix
-    ../../services/tailscale.nix
-    ../../services/jellyfin.nix
-    ../../services/sabnzbd.nix
-    ../../services/prowlarr.nix
-    ../../services/sonarr.nix
-    ../../services/radarr.nix
-    ../../services/clonarr.nix
-    ../../services/seerr.nix
-    ../../services/gitea.nix
+    ../../services/network/caddy.nix
+    ../../services/vpn/tailscale.nix
+    ../../services/media/jellyfin.nix
+    ../../services/media/sabnzbd.nix
+    ../../services/media/prowlarr.nix
+    ../../services/media/sonarr.nix
+    ../../services/media/radarr.nix
+    ../../services/media/clonarr.nix
+    ../../services/media/seerr.nix
+    ../../services/dev/gitea.nix
   ];
 
   # sabnzbd's unrar dependency is unfree; scope the allowance to just that

hosts/jupiter/vm.nix

@@ -7,11 +7,11 @@
   imports = [
     (modulesPath + "/virtualisation/virtualbox-image.nix")
     ../../common.nix              # shared base: user / ssh / nix / firewall
-    ../../services/samba.nix
-    ../../services/avahi.nix
-    ../../services/audiobookshelf.nix
+    ../../services/network/samba.nix
+    ../../services/network/avahi.nix
+    ../../services/media/audiobookshelf.nix
     ../../services/containers.nix
-    ../../services/caddy.nix
+    ../../services/network/caddy.nix
   ];
 
   networking.hostName = "jupiter";