add system error.

server/internal/types/event/events.go

@@ -2,6 +2,7 @@ package event
 
 const (
 	SYSTEM_DISCONNECT = "system/disconnect"
+	SYSTEM_ERROR      = "system/error"
 )
 
 const (

server/internal/types/message/messages.go

@@ -10,8 +10,9 @@ type Message struct {
 	Event string `json:"event"`
 }
 
-type Disconnect struct {
+type SystemMessage struct {
 	Event   string `json:"event"`
+	Title   string `json:"title"`
 	Message string `json:"message"`
 }