fix(secubox): Fix ANSI color codes in help output

- Use printf to generate actual escape sequences instead of literal strings
- Fixes colors not rendering in 'secubox help' output
- POSIX sh heredoc doesn't interpret \033 escapes

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

package/secubox/secubox-core/root/usr/sbin/secubox

@@ -7,13 +7,13 @@
 
 SECUBOX_VERSION="0.9.0"
 
-# Color output
+# Color output (using printf to generate actual escape sequences)
-RED='\033[0;31m'
+RED=$(printf '\033[0;31m')
-GREEN='\033[0;32m'
+GREEN=$(printf '\033[0;32m')
-YELLOW='\033[1;33m'
+YELLOW=$(printf '\033[1;33m')
-BLUE='\033[0;34m'
+BLUE=$(printf '\033[0;34m')
-BOLD='\033[1m'
+BOLD=$(printf '\033[1m')
-NC='\033[0m' # No Color
+NC=$(printf '\033[0m')
 
 usage() {
 	cat <<EOF