Fix 2 additional critical bugs in PHP scripts

BUG #7: php-optimizer.sh - Undefined variable in optimize_domain()
Location: modules/performance/php-optimizer.sh:507
Problem: Variable current_max_children was scoped inside if block (line 436)
         but used outside the if block (line 507), causing undefined variable
Solution: Moved declaration to line 435, before the if block
Impact: optimize_domain() would fail when trying to apply changes

BUG #8: php-analyzer.sh - calculate_memory_per_process() format mismatch
Location: lib/php-analyzer.sh:196-218
Problem: Function called get_fpm_memory_usage() expecting "kb|mb" format
         but get_fpm_memory_usage() returns only a single number (avg KB)
         This caused total_mb to always be empty
Solution: Fixed to:
  1. Accept single number from get_fpm_memory_usage()
  2. Get process_count separately
  3. Calculate total_mb = (avg_kb * process_count / 1024)
Impact: All memory calculations were wrong, showing 0 total memory

VERIFICATION:
- calculate_memory_per_process now correctly returns: avg_kb|count|total_mb
- optimize_domain can now access current_max_children when applying changes
- Memory statistics will show accurate values

lib/php-analyzer.sh

@@ -199,20 +199,23 @@ analyze_execution_timeout_errors() {
 calculate_memory_per_process() {
     local username="$1"
 
-    local memory_stats
-    memory_stats=$(get_fpm_memory_usage "$username")
+    # Get average KB per process (single number)
+    local avg_kb
+    avg_kb=$(get_fpm_memory_usage "$username")
 
-    if [ -z "$memory_stats" ] || [[ "$memory_stats" == "0|0" ]]; then
+    # Get process count
+    local process_count
+    process_count=$(get_fpm_process_count "$username")
+
+    # Check if no processes found
+    if [ -z "$avg_kb" ] || [ "$avg_kb" -eq 0 ] || [ "$process_count" -eq 0 ]; then
         echo "0|0|0"
         return
     fi
 
-    local avg_kb total_mb
-    avg_kb=$(echo "$memory_stats" | cut -d'|' -f1)
-    total_mb=$(echo "$memory_stats" | cut -d'|' -f2)
-
-    local process_count
-    process_count=$(get_fpm_process_count "$username")
+    # Calculate total memory in MB
+    local total_mb
+    total_mb=$((avg_kb * process_count / 1024))
 
     echo "$avg_kb|$process_count|$total_mb"
 }