fix(health): reduce log noise by changing periodic health reports to DEBUG level

The health manager was logging health reports every minute at INFO level,
which was too noisy for production logs. These routine operational checks
are now logged at DEBUG level instead.

Users can still see these logs by setting log level to debug, but they
won't clutter INFO-level logs during normal operation.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: juicycleff

internal/health/manager.go

@@ -677,7 +677,7 @@ func (hc *ManagerImpl) reportLoop(ctx context.Context) {
 			healthReportAnalyzer := metrics.NewHealthReportAnalyzer(report)
 
 			if hc.logger != nil {
-				hc.logger.Info(hc.Name()+" health report generated",
+				hc.logger.Debug(hc.Name()+" health report generated",
 					logger.String("overall_status", report.Overall.String()),
 					logger.Int("total_services", len(report.Services)),
 					logger.Int("healthy_count", healthReportAnalyzer.HealthyCount()),