fix: Use uppercase SYS for NFS security

setup_truenas_shares.sh

@@ -80,7 +80,7 @@ create_nfs_share() {
         \"maproot_group\": \"root\",
         \"mapall_user\": \"\",
         \"mapall_group\": \"\",
-        \"security\": [\"sys\"]
+        \"security\": ["SYS"]
     }" > /dev/null
     
     echo "✓ Created NFS share: $name ($path)"