Track events.KeepAliveRestored for connection quality monitoring

[FelixIsaac]

Track events.KeepAliveRestored events to monitor connection quality and network stability.

Why: Early warning of network instability, helps diagnose intermittent issues.

Implementation:

var keepAliveRestoreCount atomic.Uint64
case *events.KeepAliveRestored:
    keepAliveRestoreCount.Add(1)
    logger.Warnf("KeepAlive restored (total: %d)", keepAliveRestoreCount.Load())

Effort: ~10 minutes
Priority: Medium value (observability)