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.

machines/sleeper-service/hardware-configuration.nix

@@ -13,9 +13,25 @@
   boot.kernelModules = [ "kvm-intel" ];
   boot.extraModulePackages = [ ];
 
+  # ZFS Configuration for file server
   fileSystems."/" =
-    { device = "/dev/disk/by-uuid/12345678-1234-1234-1234-123456789abc";
-      fsType = "ext4";
+    { device = "filepool/root";
+      fsType = "zfs";
+    };
+
+  fileSystems."/nix" =
+    { device = "filepool/nix";
+      fsType = "zfs";
+    };
+
+  fileSystems."/var" =
+    { device = "filepool/var";
+      fsType = "zfs";
+    };
+
+  fileSystems."/mnt/storage" =
+    { device = "filepool/storage";
+      fsType = "zfs";
     };
 
   fileSystems."/boot" =