Live: http publish, refactor live interfaces (#32317)

pkg/api/dtos/live.go

@@ -0,0 +1,11 @@
+package dtos
+
+import "encoding/json"
+
+type LivePublishCmd struct {
+	Channel string          `json:"channel"`
+	Data    json.RawMessage `json:"data,omitempty"`
+}
+
+type LivePublishResponse struct {
+}