Fix batch analyzer to flag domains needing optimization increases

ISSUE:
Batch analyzer only flagged domains for optimization when recommended < current
(only reductions). Domains needing INCREASES were marked "OK" even with:
  • Critical traffic (73 concurrent requests)
  • Severely undersized configuration (5 max_children)

EXAMPLE:
  Current: 5, Recommended: 20, Traffic: 73 concurrent
  Old: Status "OK" (no change detected)
  New: Status "NEEDS OPTIMIZATION" (recognized undersizing)

FIX:
- Flag optimization when recommended != current
- ONLY if change is meaningful:
  • Has significant traffic (>= 5 concurrent requests) OR
  • Offers significant memory savings (>= 20% reduction)

RATIONALE:
- Domains with critical traffic should be optimized even if it increases max_children
- Undersized configurations are just as problematic as oversized ones
- Users need to see both increases and decreases in optimization recommendations

This ensures the batch analyzer surfaces all actionable optimization opportunities.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

modules/performance/php-fpm-batch-analyzer.sh

@@ -159,11 +159,28 @@ while IFS= read -r username; do
         TOTAL_CURRENT_MEMORY_WITH_MAX=$((TOTAL_CURRENT_MEMORY_WITH_MAX + current_memory))
 
         # Determine if optimization needed
+        # Flag as YES if: different from current (increase or decrease)
+        # AND has meaningful traffic (>= 5 concurrent) OR memory efficiency gain (> 20% reduction)
+        local memory_reduction=0
         if [ "$recommended" -lt "$current" ]; then
+            memory_reduction=$(( (current - recommended) * 100 / current ))
+        fi
+
+        if [ "$recommended" -ne "$current" ]; then
+            # Check if change is meaningful:
+            # 1. Has significant traffic (>= 5 concurrent requests)
+            # 2. OR significant memory reduction (>= 20%)
+            local has_traffic=0
+            [ "$peak" != "?" ] && [ "$peak" -ge 5 ] && has_traffic=1
+
+            if [ "$has_traffic" = "1" ] || [ "$memory_reduction" -ge 20 ]; then
                 needs_optimization[$TOTAL_DOMAINS]="YES"
             else
                 needs_optimization[$TOTAL_DOMAINS]="NO"
             fi
+        else
+            needs_optimization[$TOTAL_DOMAINS]="NO"
+        fi
 
     done <<< "$user_domains"
 done <<< "$users"