feat: Update optimizer to use three-constraint intelligent model

The optimizer now uses the same intelligent three-constraint model
as the batch analyzer for consistent recommendations:

- Calculates server capacity upfront
- Uses three-constraint intelligent function
- Falls back to profiles if available (for advanced users)
- Shows limiting factor for each recommendation
- Ensures fair distribution across all domains

This brings the optimizer in line with the batch analyzer and provides
the most intelligent, fair, and safe recommendations possible.

modules/performance/php-optimizer.sh

@@ -2459,7 +2459,16 @@ optimize_level_5_everything() {
         echo ""
     fi
 
-    cecho "${CYAN}STEP 2: Calculating Recommendations${NC}"
+    cecho "${CYAN}STEP 2: Calculating Intelligent Recommendations${NC}"
+    echo ""
+
+    # Calculate server capacity for fair share allocation
+    local server_capacity_result
+    server_capacity_result=$(calculate_server_capacity "$TOTAL_RAM_MB")
+    local server_capacity
+    server_capacity=$(echo "$server_capacity_result" | cut -d'|' -f1)
+    cecho "  Server PHP-FPM capacity: ${WHITE}${server_capacity}${NC} max_children"
+    cecho "  Using three-constraint model: Memory + Traffic + Fair Share"
     echo ""
 
     # Check if profiles exist
@@ -2502,24 +2511,30 @@ optimize_level_5_everything() {
                 current_max="?"
             fi
 
-            # Get recommendations - use profile if available, otherwise use traffic-based
+            # Get recommendations using THREE-CONSTRAINT INTELLIGENT MODEL
             local recommended_max
             local recommended_memory
             local recommended_requests
+            local traffic_pct=50  # Default if no data
 
+            # Get traffic percentage for this domain
             if [ "$profiles_exist" = "1" ] && [ -f "/tmp/php-domain-profiles/$domain.profile" ]; then
+                # Use profile data if available
                 recommended_max=$(get_max_children_recommendation "$domain" "$username")
                 recommended_memory=$(get_memory_limit_recommendation "$domain" "$username")
                 recommended_requests=$(get_max_requests_recommendation "$domain")
             else
-                # Fallback to traffic-based (old method)
+                # Use intelligent three-constraint model
-                local traffic_rpm
+                traffic_pct=$(get_domain_traffic_percentage "$username" "$domain" "$user_domains" 2>/dev/null | cut -d'|' -f1)
-                traffic_rpm=$(get_domain_peak_concurrent "$domain" 2>/dev/null || echo "0")
+                traffic_pct=${traffic_pct:-50}
-                [ "$traffic_rpm" = "?" ] && traffic_rpm="0"
 
-                recommended_max=$((traffic_rpm > 5 ? traffic_rpm + 10 : 5))
+                # Call intelligent three-constraint function
-                recommended_memory=$(calculate_optimal_memory_limit "$username" "$domain" "$traffic_rpm")
+                local intel_result
-                recommended_requests=$(calculate_optimal_max_requests "$traffic_rpm")
+                intel_result=$(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")
+                recommended_requests=$(calculate_optimal_max_requests "$recommended_max" 2>/dev/null || echo "0")
             fi
 
             recommended_max_children["$domain"]="$recommended_max"