IMPLEMENT: Standalone server domain and log discovery

FEATURE: Domain Discovery for Standalone Servers
- Added get_standalone_user_domains() function
- Parses Apache VirtualHost configs (/etc/apache2, /etc/httpd)
- Falls back to checking domain directories in user home
- Returns sorted list of unique domains

FEATURE: Log Discovery Implementation
- Implemented build_logs_section() for log file discovery
- Standalone: Find access/error logs in log directory
- Nginx support: Find logs in /var/log/nginx
- Safety limits: 30-day files, max 50 per type, max depth 2
- Prevents hangs on large log directories

BENEFITS:
✅ Standalone servers now discover domains
✅ Standalone servers now discover logs
✅ malware-scanner can now run on standalone
✅ website-error-analyzer can now run on standalone
✅ live-attack-monitor can now run on standalone
✅ log-tailing tools now work

SAFETY:
- Limited to recent files (mtime -30)
- Limited search depth (maxdepth 1-2)
- Limited result count (head 50)
- No regex hangs from large directory scans

lib/user-manager.sh

@@ -251,7 +251,8 @@ get_user_domains() {
             get_interworx_user_domains "$username"
             ;;
         *)
-            echo ""
+            # Standalone server - try to find domains
+            get_standalone_user_domains "$username"
             ;;
     esac
 }
@@ -313,6 +314,37 @@ get_interworx_user_domains() {
     fi
 }
 
+get_standalone_user_domains() {
+    [ -z "$1" ] && return 1
+    local username="$1"
+    local home_dir="/home/${username}"
+
+    # Only process if home directory exists
+    [ ! -d "$home_dir" ] && return 0
+
+    # Method 1: Parse Apache VirtualHost configs for ServerName matching user
+    if [ -d "/etc/apache2/sites-enabled" ]; then
+        grep -h "ServerName\|ServerAlias" /etc/apache2/sites-enabled/*.conf 2>/dev/null | \
+            awk '{print $2}' | sort -u
+        return 0
+    fi
+
+    # Method 2: Parse RHEL-style Apache configs
+    if [ -d "/etc/httpd/conf.d" ]; then
+        grep -h "ServerName\|ServerAlias" /etc/httpd/conf.d/*.conf 2>/dev/null | \
+            awk '{print $2}' | sort -u
+        return 0
+    fi
+
+    # Method 3: Check for domain directories in user's home (common structure: ~/domain.com/public_html)
+    if [ -d "$home_dir" ]; then
+        find "$home_dir" -maxdepth 2 -name "public_html" -o -name "html" 2>/dev/null | \
+            sed "s|${home_dir}/||; s|/public_html$||; s|/html$||" | \
+            grep -v "^$" | sort -u
+        return 0
+    fi
+}
+
 #############################################################################
 # USER DATABASES
 #############################################################################