Fix AWK-UNINIT issues by initializing variables in BEGIN blocks

lib/php-analyzer.sh:
- Line 364: Initialize sum=0 in awk for request counting
- Line 1374: Initialize sum=0 in awk for MySQL memory calculation

modules/diagnostics/loadwatch-analyzer.sh:
- Lines 748-752: Initialize i=0 for memory velocity parsing
- Lines 794-797: Initialize i=0 for load trend parsing

modules/performance/hardware-health-check.sh:
- Lines 1243, 1244, 1247: Initialize sum=0 for network error metrics

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

lib/php-analyzer.sh

@@ -361,7 +361,7 @@ calculate_avg_requests_per_minute() {
 
     # Count total requests in last N hours
     local total_requests
-    total_requests=$(find "$access_logs" -mmin -$((hours * 60)) -exec wc -l {} \; 2>/dev/null | awk '{sum+=$1} END {print sum}')
+    total_requests=$(find "$access_logs" -mmin -$((hours * 60)) -exec wc -l {} \; 2>/dev/null | awk 'BEGIN {sum=0} {sum+=$1} END {print sum}')
 
     if [ -z "$total_requests" ] || [ "$total_requests" -eq 0 ]; then
         echo "0|No recent requests"
@@ -1371,7 +1371,7 @@ detect_mysql_memory_usage() {
 
     # Try to get actual memory usage from ps
     local mysql_rss_kb
-    mysql_rss_kb=$(ps aux | grep -E "[m]ysqld|[m]ariadbd" | awk '{sum+=$6} END {print sum}')
+    mysql_rss_kb=$(ps aux | grep -E "[m]ysqld|[m]ariadbd" | awk 'BEGIN {sum=0} {sum+=$6} END {print sum}')
 
     if [ -n "$mysql_rss_kb" ] && [ "$mysql_rss_kb" -gt 0 ]; then
         local mysql_rss_mb=$((mysql_rss_kb / 1024))

modules/diagnostics/loadwatch-analyzer.sh

@@ -745,11 +745,11 @@ print_status "Phase 4/4: Generating report..."
     # Memory growth velocity
     if [ -f "$TEMP_DIR/memory_velocity.txt" ]; then
         read -r _ first_line < "$TEMP_DIR/memory_velocity.txt"
-        FIRST_AVAIL=$(echo "$first_line" | awk '{for(i=1;i<=NF;i++) if($i ~ /^first=/) print $i}' | cut -d= -f2)
+        FIRST_AVAIL=$(echo "$first_line" | awk 'BEGIN {i=0} {for(i=1;i<=NF;i++) if($i ~ /^first=/) print $i}' | cut -d= -f2)
-        LAST_AVAIL=$(echo "$first_line" | awk '{for(i=1;i<=NF;i++) if($i ~ /^last=/) print $i}' | cut -d= -f2)
+        LAST_AVAIL=$(echo "$first_line" | awk 'BEGIN {i=0} {for(i=1;i<=NF;i++) if($i ~ /^last=/) print $i}' | cut -d= -f2)
-        DELTA=$(echo "$first_line" | awk '{for(i=1;i<=NF;i++) if($i ~ /^delta=/) print $i}' | cut -d= -f2)
+        DELTA=$(echo "$first_line" | awk 'BEGIN {i=0} {for(i=1;i<=NF;i++) if($i ~ /^delta=/) print $i}' | cut -d= -f2)
-        RATE=$(echo "$first_line" | awk '{for(i=1;i<=NF;i++) if($i ~ /^rate_per_hour=/) print $i}' | cut -d= -f2)
+        RATE=$(echo "$first_line" | awk 'BEGIN {i=0} {for(i=1;i<=NF;i++) if($i ~ /^rate_per_hour=/) print $i}' | cut -d= -f2)
-        HOURS_TO_OOM=$(echo "$first_line" | awk '{for(i=1;i<=NF;i++) if($i ~ /^hours_to_oom=/) print $i}' | cut -d= -f2)
+        HOURS_TO_OOM=$(echo "$first_line" | awk 'BEGIN {i=0} {for(i=1;i<=NF;i++) if($i ~ /^hours_to_oom=/) print $i}' | cut -d= -f2)
 
         echo "Memory Growth Velocity:"
         echo "  First Available: ${FIRST_AVAIL} MiB"
@@ -791,10 +791,10 @@ print_status "Phase 4/4: Generating report..."
     # Load trend direction
     if [ -f "$TEMP_DIR/load_trend.txt" ]; then
         read -r _ trend_line < "$TEMP_DIR/load_trend.txt"
-        TREND_DIR=$(echo "$trend_line" | awk '{for(i=1;i<=NF;i++) if($i ~ /^direction=/) print $i}' | cut -d= -f2)
+        TREND_DIR=$(echo "$trend_line" | awk 'BEGIN {i=0} {for(i=1;i<=NF;i++) if($i ~ /^direction=/) print $i}' | cut -d= -f2)
-        RISING_COUNT=$(echo "$trend_line" | awk '{for(i=1;i<=NF;i++) if($i ~ /^rising=/) print $i}' | cut -d= -f2)
+        RISING_COUNT=$(echo "$trend_line" | awk 'BEGIN {i=0} {for(i=1;i<=NF;i++) if($i ~ /^rising=/) print $i}' | cut -d= -f2)
-        FALLING_COUNT=$(echo "$trend_line" | awk '{for(i=1;i<=NF;i++) if($i ~ /^falling=/) print $i}' | cut -d= -f2)
+        FALLING_COUNT=$(echo "$trend_line" | awk 'BEGIN {i=0} {for(i=1;i<=NF;i++) if($i ~ /^falling=/) print $i}' | cut -d= -f2)
-        STABLE_COUNT=$(echo "$trend_line" | awk '{for(i=1;i<=NF;i++) if($i ~ /^stable=/) print $i}' | cut -d= -f2)
+        STABLE_COUNT=$(echo "$trend_line" | awk 'BEGIN {i=0} {for(i=1;i<=NF;i++) if($i ~ /^stable=/) print $i}' | cut -d= -f2)
 
         echo "Load Trend Direction:"
         case "$TREND_DIR" in

modules/performance/hardware-health-check.sh

@@ -1240,11 +1240,11 @@ check_network_errors() {
 
         if [ -n "$stats" ]; then
             # Extract key error metrics (different NICs use different naming)
-            local rx_dropped=$(echo "$stats" | grep -iE "rx.*drop|rx_discards" | awk '{sum+=$2} END {print sum+0}')
+            local rx_dropped=$(echo "$stats" | grep -iE "rx.*drop|rx_discards" | awk 'BEGIN {sum=0} {sum+=$2} END {print sum+0}')
-            local tx_dropped=$(echo "$stats" | grep -iE "tx.*drop|tx_discards" | awk '{sum+=$2} END {print sum+0}')
+            local tx_dropped=$(echo "$stats" | grep -iE "tx.*drop|tx_discards" | awk 'BEGIN {sum=0} {sum+=$2} END {print sum+0}')
             local rx_errors=$(echo "$stats" | grep -iE "^[[:space:]]*rx_errors" | awk '{print $2}')
             local tx_errors=$(echo "$stats" | grep -iE "^[[:space:]]*tx_errors" | awk '{print $2}')
-            local crc_errors=$(echo "$stats" | grep -iE "crc.*error|rx_crc" | awk '{sum+=$2} END {print sum+0}')
+            local crc_errors=$(echo "$stats" | grep -iE "crc.*error|rx_crc" | awk 'BEGIN {sum=0} {sum+=$2} END {print sum+0}')
 
             # Accumulate totals
             total_rx_dropped=$((total_rx_dropped + rx_dropped))