CRITICAL FIX: Filter debug output from cache file

Problem: System detection messages (from print_info) were being captured in cache
file along with actual WordPress paths, creating garbage entries

Solution: Filter output to extract only lines matching /path/to/wp-config.php pattern
before saving to cache file

This ensures cache contains ONLY actual WordPress installation paths.

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

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

@@ -399,8 +399,13 @@ initialize_wp_cache() {
     echo "[INFO] Scanning for WordPress installations (building cache)..." >&2
 
     # Run the discovery and save to temp file for persistence
-    # CRITICAL: Suppress all output from get_wp_search_paths to avoid capturing debug messages
-    WP_SITES_CACHE=$(get_wp_search_paths "$panel" 2>/dev/null)
+    # CRITICAL: Suppress stdout noise from system detection by redirecting to temp, then extracting only paths
+    local temp_discovery=$(mktemp)
+    get_wp_search_paths "$panel" > "$temp_discovery" 2>/dev/null
+    # Extract only lines that are actual file paths (contain /home or /var, start with /)
+    WP_SITES_CACHE=$(grep -E "^/.*wp-config\.php$" "$temp_discovery" 2>/dev/null || echo "")
+    rm -f "$temp_discovery"
+
     echo "$WP_SITES_CACHE" > "$WP_CACHE_FILE" 2>/dev/null
     WP_CACHE_INITIALIZED=1