Fix sig-count parsing in start.sh — clamd logs 'Loaded N signatures.'

The previous grep matched lowercase 'loaded' which never appears, so the
ready banner always reported '0 databases loaded' even when clamd had
3.8M sigs in memory. Parse the actual 'Loaded N signatures' line.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

start.sh

@@ -13,7 +13,8 @@ start_clamd() {
         cat /tmp/clamd.log 2>/dev/null
         exit 2
     fi
-    echo "clamd ready ($(cat /tmp/clamd.log 2>/dev/null | grep -c 'loaded') databases loaded)"
+    sigs=$(grep -oE 'Loaded [0-9]+ signatures' /tmp/clamd.log 2>/dev/null | grep -oE '[0-9]+' | tail -1)
+    echo "clamd ready (${sigs:-0} signatures loaded)"
 }
 
 case "${1}" in