fix: nil HTTP recorder ref in WebSocket goroutines, add tunnel loop detection

- handler/http/websocket, forwarder/sniffer_ws, sniffing/sniffer_ws: nil
  ro2.HTTP in WebSocket copy goroutines to avoid data races on the shared
  HTTP recorder object
- handler/tunnel/bind: remove ingress rule check that incorrectly
  overrode the endpoint host for non-matching ingress rules
- handler/tunnel/entrypoint: add forwarding loop detection by checking
  Gost-Forwarded-Node header for the entrypoint's own node ID

handler/http/websocket.go

@@ -51,6 +51,7 @@ func (h *httpHandler) copyWebsocketDirection(ctx context.Context, r io.Reader, w
 	}
 	ro2 := &xrecorder.HandlerRecorderObject{}
 	*ro2 = *ro
+	ro2.HTTP = nil
 	r2 := ro2
 
 	limiter := rate.NewLimiter(rate.Limit(sampleRate), int(sampleRate))