fix: show restart command when codeman-web is not a systemd service

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

install.sh

@@ -1290,7 +1290,8 @@ update() {
         systemctl --user restart codeman-web.service
         success "codeman-web service restarted"
     else
-        echo -e "  ${DIM}Restart codeman web to use the new version.${NC}"
+        echo -e "  ${DIM}Restart codeman web to use the new version:${NC}"
+        echo -e "    ${CYAN}codeman web${NC}  ${DIM}# or: node ~/.codeman/app/dist/index.js web${NC}"
     fi
     echo ""
 }