fix: add more mutex locks for Clients map

internal/websocket/client_commands.go

@@ -22,7 +22,9 @@ func handleClientCommands(c models.WebsocketClient) {
 		_, message, err := ws.ReadMessage()
 		if err != nil {
 			// remove client on error/disconnect
+			mu.Lock()
 			delete(Clients, ws.LocalAddr())
+			mu.Unlock()
 			helper.Logger.Info("Client disconnected:", "msg", err, "host", c.RealIP, "clients", len(Clients))
 			break
 		}