fix: update device serial number in JackeryHome sensor

- Changed the device serial number from an empty string to a specific value for improved identification and functionality.

custom_components/JackeryHome/sensor.py

@@ -208,7 +208,7 @@ class JackeryHomeSensor(SensorEntity):
         self._attr_native_value = None
         self._attr_available = False
         self._data_task = None
-        self._device_sn = ""  # 设备序列号（从 LWT 消息中获取）
+        self._device_sn = "26392658575364"  # 设备序列号（从 LWT 消息中获取）
         self._attr_should_poll = False
         self._attr_has_entity_name = True 
         # 获取 meter_sn，对于功率传感器，使用对应的 _power 键