B6 backend: probe notification engine — hub-faithful sweep (offline/recovery with flap discipline, traffic steps, expiry digest + auto-renewal, login), Telegram via the panel bot + webhook channel, notify settings/test/coverage API, login hook

internal/web/web.go

@@ -365,6 +365,19 @@ func (s *Server) startTask(restartXray bool, loc *time.Location) {
 		job.NewProbeHistoryJob().Run()
 	}()
 
+	// Probe notifications (item 7 B6): the connectivity/traffic sweep
+	// every 30s (the hub's cadence — an offline alert trails its
+	// grace period by at most one sweep), and the expiry
+	// housekeeping hourly on the hour so a date rolls within seconds
+	// of midnight, plus the same one-minute startup kick as above
+	// (the hub runs its housekeeping immediately at boot).
+	_, _ = s.cron.AddJob("@every 30s", job.NewProbeNotifyJob())
+	_, _ = s.cron.AddJob("@hourly", job.NewProbeNotifyHousekeepingJob())
+	go func() {
+		time.Sleep(time.Minute)
+		job.NewProbeNotifyHousekeepingJob().Run()
+	}()
+
 	// check client ips from log file every day
 	_, _ = s.cron.AddJob("@daily", job.NewClearLogsJob())
 	_, _ = s.cron.AddJob(cadenceXrayLogPrune, job.NewPruneXrayLogsJob())