refactor(discovery): use ping for discovery and fill MAC via SSH

auto-check/scripts/sysinfo.sh

@@ -0,0 +1,8 @@
+echo '===SYSTEM_INFO==='
+echo "hostname:$(hostname)"
+echo "cpu:$(lscpu 2>/dev/null | grep 'Model name' | sed 's/Model name:\s*//' || echo unknown)"
+echo "cores:$(nproc 2>/dev/null || echo 0)"
+echo "memory:$(free -h 2>/dev/null | awk '/Mem:/{print $2}' || echo unknown)"
+echo "kernel:$(uname -r 2>/dev/null || echo unknown)"
+echo "disk:$(lsblk -d -o NAME,SIZE 2>/dev/null | head -3 | tr '\n' ' ')"
+echo ''