fix: log message for unconfigured Kuma push monitor

bot.go

@@ -66,6 +66,8 @@ func main() {
 		}
 		go startKumaPush(kumaPushURL, interval)
 		log.Printf("Kuma push monitor started (URL: %s, Interval: %ds)", kumaPushURL, interval)
+	}  else {
+		log.Println("Kuma push monitor not configured.")
 	}
 
 	// Wait here until CTRL-C or other term signal is received.