FIX: Add missing color variable definitions to generator

CRITICAL BUG FIX: The generator script (malware-scanner.sh) was using color
variables (CYAN, RED, YELLOW, GREEN, NC) in the show_scan_menu() and other
functions, but these variables were never defined in the generator itself.

This caused:
- Menu display would have no color codes (empty variables)
- Installation guide would have no color codes
- Poor user experience on the menu system

Solution:
- Added color variable definitions at script start (matching launcher.sh)
- RED, GREEN, YELLOW, CYAN, BOLD, NC are now defined
- Colors will display correctly in all menu functions

Note: Color variables were already defined in the heredoc (standalone scanner)
but were missing from the generator code itself.

modules/security/malware-scanner.sh

@@ -10,6 +10,14 @@
 
 set -eo pipefail
 
+# Color definitions (matching launcher.sh)
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+CYAN='\033[0;36m'
+BOLD='\033[1m'
+NC='\033[0m'
+
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
 
 # Source required libraries (warn if missing, but allow graceful degradation)