Fix WordPress path parsing for multi-panel support in reference-db.sh

Problem:
User reported launcher showing "0 0 domains", "0 0 users", "0 0 databases"
on Plesk server after pulling from git. Root cause was build_wordpress_section()
in reference-db.sh assuming cPanel-only directory structure.

Changes to lib/reference-db.sh:

1. WordPress Username/Domain Extraction (lines 282-304):
   - OLD: Hardcoded /home/username/ path extraction
   - NEW: Panel-agnostic case statement:
     * cPanel: Extract from /home/username/
     * Plesk: Extract domain from /var/www/vhosts/domain.com/, get owner via get_domain_owner()
     * InterWorx: Extract from /chroot/home/user/var/domain.com/
     * Standalone: Use stat -c "%U" to get filesystem owner

2. cPanel Domain Inference (lines 306-322):
   - Moved cPanel-specific path parsing inside conditional
   - Only runs if domain not already set AND on cPanel
   - Removed duplicate "local domain=" declaration

Impact:
WordPress section in system reference database will now correctly identify
WordPress installations on Plesk (/var/www/vhosts/) and InterWorx
(/chroot/home/) servers, not just cPanel (/home/).

Related Commits:
- 589247d: Fixed build_domains_section() to use unified discovery
- 0984e76: Fixed domain-discovery.sh Plesk helper sourcing

Status: READY FOR TESTING ON PLESK SERVER

Remaining Work:
Comprehensive audit found 13 additional modules with cPanel-specific code
that need similar multi-panel support. See /tmp/plesk-migration-status.md
for full migration plan and recommendations.

lib/reference-db.sh

@@ -279,24 +279,46 @@ build_wordpress_section() {
     for wp_config in $wp_configs; do
         local wp_dir=$(dirname "$wp_config")
 
-        # Extract username from path (/home/username/...)
-        local username=$(echo "$wp_dir" | cut -d'/' -f3)
-
-        # Try to get domain from path - check if it's in a subdomain or addon domain folder
-        local path_after_home=$(echo "$wp_dir" | sed "s|^/home/$username/||")
+        # Extract username/domain from path (panel-agnostic)
+        local username=""
         local domain=""
 
-        # Check for common domain folder patterns
-        if [[ "$path_after_home" == public_html ]]; then
-            # This is the primary domain - get it from user info
-            domain=$(grep "USER|${username}|" "$SYSREF_DB" 2>/dev/null | cut -d'|' -f3 || true)
-        elif [[ "$path_after_home" =~ ^public_html/(.+) ]]; then
-            # Could be subdomain or subdirectory - extract folder name
-            local folder=$(echo "$path_after_home" | cut -d'/' -f2)
-            domain="${folder}"
-        else
-            # Might be addon/parked domain with own directory
-            domain=$(echo "$path_after_home" | cut -d'/' -f1)
+        case "$SYS_CONTROL_PANEL" in
+            cpanel)
+                # cPanel: /home/username/...
+                username=$(echo "$wp_dir" | cut -d'/' -f3)
+                ;;
+            plesk)
+                # Plesk: /var/www/vhosts/domain.com/...
+                domain=$(echo "$wp_dir" | cut -d'/' -f5)
+                username=$(get_domain_owner "$domain" 2>/dev/null || echo "unknown")
+                ;;
+            interworx)
+                # InterWorx: /chroot/home/user/var/domain.com/...
+                username=$(echo "$wp_dir" | cut -d'/' -f4)
+                ;;
+            *)
+                # Standalone: try to extract from path
+                username=$(stat -c "%U" "$wp_dir" 2>/dev/null || echo "unknown")
+                ;;
+        esac
+
+        # If domain not set yet (cPanel/InterWorx/Standalone), try to infer from path
+        if [ -z "$domain" ] && [ "$SYS_CONTROL_PANEL" = "cpanel" ]; then
+            # cPanel: check if this is primary domain or addon/subdomain
+            local path_after_home=$(echo "$wp_dir" | sed "s|^/home/$username/||")
+
+            if [[ "$path_after_home" == public_html ]]; then
+                # This is the primary domain - get it from user info
+                domain=$(grep "USER|${username}|" "$SYSREF_DB" 2>/dev/null | cut -d'|' -f3 || true)
+            elif [[ "$path_after_home" =~ ^public_html/(.+) ]]; then
+                # Could be subdomain or subdirectory - extract folder name
+                local folder=$(echo "$path_after_home" | cut -d'/' -f2)
+                domain="${folder}"
+            else
+                # Might be addon/parked domain with own directory
+                domain=$(echo "$path_after_home" | cut -d'/' -f1)
+            fi
         fi
 
         # Try to get actual domain from WP database options (more reliable)