CRITICAL FIXES: Trap handler flock unlock + user extraction cache bypass

Fix #1: Duplicate trap handlers with missing flock unlock (CRITICAL)
  Problem: Line 32 set trap with flock unlock, line 373 overwrote it
  Result: Flock never unlocked, lock file stays locked
  Fix: Consolidated into single trap with flock unlock
  Impact: Prevents future invocations from being blocked

Fix #2: User extraction cache being bypassed (10 locations)
  Problem: get_user_from_path_cached() existed but 10 places called
           extract_user_from_path() directly, bypassing cache
  Result: For 200 sites, user extraction done 200+ times without cache
  Fix: Replaced all 10 direct calls with cached version
  Locations: Lines 1308, 1364, 1687, 1836, 2051, 2180, 2369, 2537, 2700
  Impact: Eliminates redundant stat calls for user extraction

Fix #3: Removed duplicate first trap
  Problem: Line 32 had first trap that was immediately overwritten
  Fix: Removed with note that single trap at line 373 handles both
  Impact: Cleaner code, prevents confusion

modules/website/wordpress/wordpress-cron-manager.sh

@@ -29,7 +29,7 @@ if ! flock -n 9; then
     print_error "Another instance of this script is already running"
     exit 1
 fi
-trap 'flock -u 9; rm -f "$LOCK_FILE"' EXIT INT TERM
+# NOTE: Trap is set later at line ~373, MUST include flock unlock!
 
 # OPTIMIZATION: Parse command-line flags for script behavior
 # Support: --dry-run, --parallel, --log, --help
@@ -370,7 +370,8 @@ get_wp_sites_cached() {
 }
 
 # Cleanup on exit (keep cache file for next invocation, only remove lock file)
-trap 'rm -f "$LOCK_FILE"; rollback_cleanup' EXIT INT TERM
+# CRITICAL: Must unlock flock (fd 9) before removing lock file!
+trap 'flock -u 9 2>/dev/null; rm -f "$LOCK_FILE"; rollback_cleanup' EXIT INT TERM
 
 # OPTIMIZATION: User extraction caching (memoization)
 # extract_user_from_path() called 10 times, often for same path
@@ -387,7 +388,7 @@ get_user_from_path_cached() {
     fi
 
     # Not in cache, extract and cache result
-    local user=$(extract_user_from_path "$site_path")
+    local user=$(get_user_from_path_cached "$site_path")
     USER_EXTRACTION_CACHE[$site_path]="$user"
     echo "$user"
 }
@@ -1304,7 +1305,7 @@ preflight_check() {
     while IFS= read -r wp_config; do
         found_count=$((found_count + 1))
         site_path=$(dirname "$wp_config")
-        user=$(extract_user_from_path "$site_path")
+        user=$(get_user_from_path_cached "$site_path")
 
         # Verify user is valid
         if ! user_is_valid "$user"; then
@@ -1360,7 +1361,7 @@ show_installation_status() {
     while IFS= read -r wp_config; do
         count=$((count + 1))
         site_path=$(dirname "$wp_config")
-        user=$(extract_user_from_path "$site_path")
+        user=$(get_user_from_path_cached "$site_path")
 
         # Check wp-cron status
         if disable_wp_cron_exists "$wp_config"; then
@@ -1683,7 +1684,7 @@ case "$choice" in
                 site_path=$(dirname "$config_file")
 
                 # Extract user and domain based on control panel
-                user="$(extract_user_from_path "$site_path")"
+                user="$(get_user_from_path_cached "$site_path")"
                 domain=""
                 case "$SYS_CONTROL_PANEL" in
                     cpanel)
@@ -1832,7 +1833,7 @@ case "$choice" in
 
         # Extract site path and user
         site_path=$(dirname "$wp_config")
-        user=$(extract_user_from_path "$site_path")
+        user=$(get_user_from_path_cached "$site_path")
 
         # PRE-FLIGHT VALIDATION CHECKS
         echo "Running pre-flight validation checks..."
@@ -2047,7 +2048,7 @@ case "$choice" in
             fi
 
             # Extract user from site path (per-site, not using $target_user assumption)
-            user=$(extract_user_from_path "$site_path")
+            user=$(get_user_from_path_cached "$site_path")
             if [ -z "$user" ]; then
                 echo -e "${YELLOW}Warning: Could not extract username from $site_path${NC}"
                 failed=$((failed + 1))
@@ -2176,7 +2177,7 @@ case "$choice" in
                 failed=$((failed + 1))
                 continue
             fi
-            user=$(extract_user_from_path "$site_path")
+            user=$(get_user_from_path_cached "$site_path")
 
             echo -e "${BOLD}Processing:${NC} $site_path (user: $user)"
 
@@ -2365,7 +2366,7 @@ case "$choice" in
 
                 # Check for cron job
                 site_path=$(dirname "$wp_config")
-                user=$(extract_user_from_path "$site_path")
+                user=$(get_user_from_path_cached "$site_path")
 
                 if crontab -u "$user" -l 2>/dev/null | grep -q "$WP_CRON_FILENAME"; then
                     echo -e "System cron: ${GREEN}CONFIGURED${NC}"
@@ -2533,7 +2534,7 @@ case "$choice" in
 
         # Remove cron job - Multi-panel support
         site_path=$(dirname "$wp_config")
-        user=$(extract_user_from_path "$site_path")
+        user=$(get_user_from_path_cached "$site_path")
 
         if [ "$DRY_RUN" = "true" ]; then
             echo "[DRY-RUN] Would remove cron job from user crontab"
@@ -2696,7 +2697,7 @@ case "$choice" in
                 failed=$((failed + 1))
                 continue
             fi
-            user=$(extract_user_from_path "$site_path")
+            user=$(get_user_from_path_cached "$site_path")
 
             echo -e "${BOLD}Processing:${NC} $site_path (user: $user)"