[led] check know wifi

wifi_manager.py

@@ -257,10 +257,10 @@ def force_scan_wifi():
             break
         if led_enabled:
             for i in range(4):
-                orangepi.set_led_off('red')
-                time.sleep(0.25)
                 orangepi.set_led_on('red')
                 time.sleep(0.25)
+                orangepi.set_led_off('red')
+                time.sleep(0.25)
         else:
             time.sleep(2)  # 等待2秒，确保wifi scan完成
     return wifi_list