OpenClaw nostr DM updates:
- Prevent flood of old messages on restart
- Fixed crash on rate limited and other 
- Auto-reconnect with exponential backoff

To update tell your OpenClaw to update to the latest version of https://github.com/fabianfabian/openclaw-nostr-nip17.git
nostr:nevent1qqst6xj2m2g8yyfvdhrm7fg8xx2ermpswax58lzwpkfje6qy7j3kduszyzd7p0swvnfc52dfemy6tj80tkrnc2l62d32fd2cmf0ldx7rewupuqcyqqqqqqgpzamhxue69uhkvctzd9skutnwdaehgu339e3k7mg89348v