feat(tools): add root-ssh-login tool to enable or disable root SSH password login

- add tools/root-ssh-login.sh with interactive menu, --enable/--disable/--status flags, and sshd drop-in config management
- register root-ssh-login in lxs.sh dispatch and tools/index.sh interactive menu
- document new tool in README.md command reference and project structure

tools/index.sh

@@ -62,9 +62,10 @@ menu_tools() {
         echo -e "  ${YELLOW}[3]${NC} Harden Server"
         echo -e "  ${GREEN}[4]${NC} Change Root Password"
         echo -e "  ${CYAN}[5]${NC} Update Server"
+        echo -e "  ${YELLOW}[6]${NC} Root SSH Password Login"
         echo -e "  ${RED}[0]${NC} Back"
         echo ""
-        echo -e -n "${BOLD}Choice [0-5]: ${NC}"
+        echo -e -n "${BOLD}Choice [0-6]: ${NC}"
         read -r choice
 
         case $choice in
@@ -73,8 +74,9 @@ menu_tools() {
             3) run_sibling "tools/harden.sh" ;;
             4) run_sibling "tools/root-password.sh" ;;
             5) run_sibling "tools/update-server.sh" ;;
+            6) run_sibling "tools/root-ssh-login.sh" ;;
             0) return ;;
-            *) echo -e "${RED}[✗] Invalid option. Please select 0-5.${NC}"; sleep 1; continue ;;
+            *) echo -e "${RED}[✗] Invalid option. Please select 0-6.${NC}"; sleep 1; continue ;;
         esac
 
         if [ "$choice" != "0" ]; then