Add ZFS support to sleeper-service

- Replace ext4 with ZFS pool 'filepool' for enhanced data integrity
- Add ZFS auto-scrub and TRIM services for file server
- Configure proper ZFS datasets: root, nix, var, storage
- Add networking hostId (a1b2c3d4) required for ZFS
- Update NFS and Transmission to use ZFS mount points
- Change file ownership to 'sma' user for server configuration
- Add comprehensive ZFS setup documentation

Ready for deployment with proper file server storage backend.

modules/services/nfs.nix

@@ -6,7 +6,7 @@
   # NFS server configuration
   services.nfs.server = {
     enable = true;
-    # Export the storage directory
+    # Export the storage directory (ZFS dataset)
     exports = ''
       /mnt/storage    10.0.0.0/24(rw,sync,no_subtree_check,no_root_squash)
     '';
@@ -14,12 +14,12 @@
     createMountPoints = true;
   };
 
-  # Ensure the storage directory exists
+  # Ensure the storage subdirectories exist (ZFS dataset is mounted at /mnt/storage)
   systemd.tmpfiles.rules = [
-    "d /mnt/storage 0755 geir users -"
-    "d /mnt/storage/media 0755 geir users -"
-    "d /mnt/storage/downloads 0755 geir users -"
-    "d /mnt/storage/backups 0755 geir users -"
+    "d /mnt/storage/media 0755 sma users -"
+    "d /mnt/storage/downloads 0755 sma users -"
+    "d /mnt/storage/backups 0755 sma users -"
+    "d /mnt/storage/shares 0755 sma users -"
   ];
 
   # Required packages for NFS