fix: 环境雨量字段映射到 dock environment

realtime.rainfall 等别名写入 environment，监控雨量可显示。

src/stores/modules/devicesStore.js

@@ -64,6 +64,7 @@ function environmentValues(realtime) {
   }
   return {
     rain: value('rain'),
+    rainfall: value('rainfall', 'rainAmount', 'rainFall', 'precipitation'),
     windSpeed: value('windSpeed', 'wind_speed'),
     outsideTemperature: value('outsideTemperature', 'outside_temperature'),
     outsideHumidity: value('outsideHumidity', 'outside_humidity'),