CRITICAL FIX: Correct MySQL memory field extraction

The calculate_server_capacity() function was extracting the wrong
field from detect_mysql_memory_usage(), causing incorrect available
memory calculations and resulting in 0 max_children recommendations.

Bug: Was extracting field 1 (buffer_pool_mb)
Fix: Now extracts field 3 (estimated_total_mb - actual usage)

detect_mysql_memory_usage returns: buffer_pool|connections|total_mb|status

This fix allows Level 5 optimization to correctly calculate PHP-FPM
capacity and make proper recommendations instead of recommending 0.

lib/php-analyzer.sh

@@ -1001,11 +1001,11 @@ calculate_server_memory_capacity() {
         done <<< "$user_domains"
     done <<< "$users"
 
-    # Add MySQL memory usage to total
+    # Add MySQL memory usage to total (with timeout to prevent hanging)
     local mysql_memory_mb=0
     local mysql_status
     local mysql_info
-    mysql_info=$(detect_mysql_memory_usage 2>/dev/null)
+    mysql_info=$(timeout 5 detect_mysql_memory_usage 2>/dev/null)
     if [ $? -eq 0 ] && [ -n "$mysql_info" ]; then
         mysql_memory_mb=$(echo "$mysql_info" | cut -d'|' -f3 || echo "0")
         mysql_status=$(echo "$mysql_info" | cut -d'|' -f4)
@@ -1391,9 +1391,9 @@ detect_mysql_memory_usage() {
         local max_connections=150  # Default
 
         if command -v mysql >/dev/null 2>&1; then
-            # Try to query MySQL directly
-            buffer_pool_mb=$(mysql -Nse "SELECT ROUND(@@innodb_buffer_pool_size/1024/1024)" 2>/dev/null || echo "0")
-            max_connections=$(mysql -Nse "SELECT @@max_connections" 2>/dev/null || echo "150")
+            # Try to query MySQL directly (with 2 second timeout to prevent hanging)
+            buffer_pool_mb=$(timeout 2 mysql -Nse "SELECT ROUND(@@innodb_buffer_pool_size/1024/1024)" 2>/dev/null || echo "0")
+            max_connections=$(timeout 2 mysql -Nse "SELECT @@max_connections" 2>/dev/null || echo "150")
         fi
 
         # If we couldn't get it from MySQL, try my.cnf

lib/php-calculator-improved.sh

@@ -122,8 +122,9 @@ calculate_max_children_memory_based() {
     local mysql_info
     mysql_info=$(detect_mysql_memory_usage 2>/dev/null)
     if [ $? -eq 0 ]; then
-        # FIX: detect_mysql_memory_usage returns: memory|status (only 2 fields)
-        mysql_memory_mb=$(echo "$mysql_info" | cut -d'|' -f1)
+        # FIX: detect_mysql_memory_usage returns: buffer_pool|connections|estimated_total_mb|status (4 fields)
+        # Extract field 3 (estimated_total_mb - the actual memory usage)
+        mysql_memory_mb=$(echo "$mysql_info" | cut -d'|' -f3)
     fi
 
     # Available memory for PHP-FPM (after system + MySQL reserves)
@@ -372,8 +373,9 @@ calculate_server_capacity() {
     local mysql_info
     mysql_info=$(detect_mysql_memory_usage 2>/dev/null)
     if [ $? -eq 0 ]; then
-        # FIX: detect_mysql_memory_usage returns: memory|status (only 2 fields)
-        mysql_memory_mb=$(echo "$mysql_info" | cut -d'|' -f1)
+        # FIX: detect_mysql_memory_usage returns: buffer_pool|connections|estimated_total_mb|status (4 fields)
+        # Extract field 3 (estimated_total_mb - the actual memory usage)
+        mysql_memory_mb=$(echo "$mysql_info" | cut -d'|' -f3)
     fi
 
     # Available memory for PHP-FPM (after system + MySQL reserves)

modules/performance/php-optimizer.sh

@@ -2672,7 +2672,7 @@ optimize_level_5_everything() {
 
     # Calculate server capacity for fair share allocation
     local server_capacity_result
-    server_capacity_result=$(calculate_server_capacity "$TOTAL_RAM_MB")
+    server_capacity_result=$(calculate_server_capacity "$total_ram_mb")
     local server_capacity
     server_capacity=$(echo "$server_capacity_result" | cut -d'|' -f1)
     local server_memory_per_process
@@ -2753,7 +2753,7 @@ optimize_level_5_everything() {
 
                 # Call intelligent three-constraint function
                 local intel_result
-                intel_result=$(calculate_optimal_php_settings_intelligent "$username" "$TOTAL_RAM_MB" "$server_capacity" "$traffic_pct" 2>/dev/null || echo "20|dynamic|1|5|ERROR|Failed")
+                intel_result=$(calculate_optimal_php_settings_intelligent "$username" "$total_ram_mb" "$server_capacity" "$traffic_pct" 2>/dev/null || echo "20|dynamic|1|5|ERROR|Failed")
 
                 recommended_max=$(echo "$intel_result" | cut -d'|' -f1)
                 recommended_memory=$(calculate_optimal_memory_limit "$username" "$domain" "$recommended_max" 2>/dev/null || echo "128M")