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

internal/middleware/cache.go

@@ -0,0 +1,18 @@
+package middleware
+
+import (
+	"game-driver/config"
+	"game-driver/leaf"
+	"go.uber.org/zap"
+)
+
+// Cache 缓存中间件
+func Cache(cache config.Cache) leaf.HandlerFunc {
+	return func(c *leaf.Context) {
+		err := cache.Set(c.Publish)
+		if err != nil {
+			zap.S().Errorln("缓存数据失败: ", err)
+		}
+		c.Next()
+	}
+}