feat: add auto token refresh for ALL platforms

New qwen-token-refresh.sh script provides automatic token refresh
for OpenClaw, NanoBot, PicoClaw, NanoClaw (ZeroClaw has native support).

Features:
- Check token status and expiry
- Auto-refresh when < 5 min remaining
- Background daemon mode (5 min intervals)
- Systemd service installation
- Updates both oauth_creds.json and .env file

Usage:
  ./scripts/qwen-token-refresh.sh --status   # Check status
  ./scripts/qwen-token-refresh.sh            # Refresh if needed
  ./scripts/qwen-token-refresh.sh --daemon   # Background daemon
  ./scripts/qwen-token-refresh.sh --install  # Systemd service

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

skills/claw-setup/scripts/import-qwen-oauth.sh

@@ -199,4 +199,10 @@ echo ""
 echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
 echo "FREE Qwen OAuth: 2,000 requests/day, 60 req/min"
 echo "API Endpoint: https://dashscope.aliyuncs.com/compatible-mode/v1"
+echo ""
+echo "🔄 AUTO TOKEN REFRESH (for non-ZeroClaw platforms):"
+echo "   ./scripts/qwen-token-refresh.sh --status   # Check status"
+echo "   ./scripts/qwen-token-refresh.sh            # Refresh if needed"
+echo "   ./scripts/qwen-token-refresh.sh --daemon   # Background daemon"
+echo "   ./scripts/qwen-token-refresh.sh --install  # Systemd service"
 echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"