monitoring: host-agent HTML, surface, aptdeploy, sticky bar

Complete taler-monitoring host-agent (hacktivism/surface/aptdeploy timers),
site-gen console HTML with sticky status bar and collapsible scope, apt-src
deploy tests, remote surface inventory, and Caddy monitoring handle snippets.

scripts/taler-monitoring/check_server.sh

@@ -110,6 +110,15 @@ if systemctl is-active caddy >/dev/null 2>&1 || pgrep -x caddy >/dev/null 2>&1;
 else
   report WARN "caddy" "not detected as active"
 fi
+
+# disk free (host + containers) — lines for mon_disk_check_remote_text on laptop side
+echo "###DISK_HOST###"
+df -Pk / /var /home /tmp 2>/dev/null || df -Pk
+echo "###DISK_CTRS###"
+for c in $(podman ps --format '{{.Names}}' 2>/dev/null); do
+  echo "###CTR $c###"
+  podman exec "$c" df -Pk / /var /tmp 2>/dev/null || podman exec "$c" df -Pk 2>/dev/null
+done
 REMOTE
 )
 
@@ -126,4 +135,24 @@ while IFS= read -r line; do
   esac
 done <<<"$REMOTE"
 
+set_group disk
+section "server · disk free space"
+_host_df=$(printf '%s\n' "$REMOTE" | sed -n '/^###DISK_HOST###$/,/^###DISK_CTRS###$/p' | sed '1d;$d')
+mon_disk_check_remote_text "ssh:${KOOPA_SSH}" "$_host_df" || true
+_ctr=""; _buf=""
+while IFS= read -r _line || [ -n "$_line" ]; do
+  case "$_line" in
+    '###CTR '*)
+      if [ -n "$_ctr" ]; then mon_disk_check_remote_text "ctr:${_ctr}" "$_buf" || true; fi
+      _ctr=${_line####CTR }; _ctr=${_ctr%###}; _buf=""
+      ;;
+    '###DISK_CTRS###'|'###DISK_HOST###') ;;
+    *)
+      # only buffer after we entered CTR section
+      if [ -n "$_ctr" ]; then _buf="${_buf}${_line}"$'\n'; fi
+      ;;
+  esac
+done <<<"$REMOTE"
+[ -n "$_ctr" ] && mon_disk_check_remote_text "ctr:${_ctr}" "$_buf" || true
+
 summary