增加待机报文缓存，无网状态也能执行待机任务；投影仪指令结果以设备状态为准

config/config.go

@@ -34,13 +34,14 @@ type Logger struct {
 }
 
 type config struct {
-	Location   string
-	Point      int
-	Relay      string
-	Log        Logger
-	Mqtt       MqttConfig
-	Aliyun     AliyunConfig
-	MaxTimeout int
+	Location     string
+	Point        int
+	Relay        string
+	Log          Logger
+	Mqtt         MqttConfig
+	Aliyun       AliyunConfig
+	MaxTimeout   int
+	StandbyCache Cache
 }
 
 var C config