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de8d860244
fix: handle legacy agent heartbeat without server_id + migrate on_event to lifespan
- AgentHeartbeat.server_id changed to Optional[int] — missing server_id
now returns 200 (discarded) instead of 422, stopping retry loops
- web/agent/agent.py: on_event("startup") → FastAPI lifespan pattern
- Added exponential backoff on consecutive heartbeat failures (cap 5min)
- Agent stops heartbeat loop on "discarded" response from central
- main.py: promoted temporary debug 422 handler to production-grade
- uninstall.sh: added legacy agent cleanup (pkill patterns, crontab,
/opt/multisync-agent path)
- Confirmed servers.html batch buttons work correctly (disabled state
is correct when no agents installed)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>