fix(realtime): 修复ws 握手失败、计费问题

(cherry picked from commit 618dffc43fd5a5f4065944db87761f9ee18e44d3)

controller/relay.go

@@ -145,6 +145,7 @@ func Relay(c *gin.Context) {
 }
 
 var upgrader = websocket.Upgrader{
+	Subprotocols: []string{"realtime"}, // WS 握手支持的协议，如果有使用 Sec-WebSocket-Protocol，则必须在此声明对应的 Protocol TODO add other protocol
 	CheckOrigin: func(r *http.Request) bool {
 		return true // 允许跨域
 	},