feat: handle X-Forward-For for log output

- add Gorilla handlers package for enhanced HTTP handling
- refactor HTTP server to use a new ServeMux for routing
- update ListenAndServe to utilize ProxyHeaders for better proxy support
- add RealIP field to client model
  - use RealIP fild for connect/disconnect log output

internal/websocket/client_commands.go

@@ -21,8 +21,8 @@ func handleClientCommands(c models.WebsocketClient) {
 
 		_, message, err := ws.ReadMessage()
 		if err != nil {
-			log.Info("Client disconnected:", "msg", err, "host", ws.RemoteAddr(), "clients", len(Clients)-1)
 			delete(Clients, ws.LocalAddr())
+			log.Info("Client disconnected:", "msg", err, "host", c.RealIP, "clients", len(Clients))
 			break
 		}