FIX: Add error handling to FPM process count function

Fixed line 282 in lib/php-detector.sh:
- Changed: ps aux | grep | grep -v | wc -l
- To: local count=$(... || echo 0) with explicit echo

This prevents pipe failure with set -eo pipefail if no FPM processes
match the search pattern. Function now returns 0 instead of crashing.

lib/php-detector.sh

@@ -279,7 +279,8 @@ get_fpm_process_count() {
     [ -z "$1" ] && return 1
     local pool_name="$1"  # Usually username or domain
 
-    ps aux | grep -E "php-fpm.*pool\s+${pool_name}" | grep -v grep | wc -l
+    local count=$(ps aux | grep -E "php-fpm.*pool\s+${pool_name}" | grep -v grep | wc -l || echo 0)
+    echo "$count"
 }
 
 # Get memory usage per FPM process for a pool