Fix transport socket implementation for HTTP/SSE

[gophergogo]

transport socket is not working for HTTP/SSE

TransportIoResult ConnectionImpl::doReadFromSocket() {
  // Read from transport socket or directly from socket

  // Use transport socket for reading if available
  // TODO: Fix transport socket implementation for HTTP/SSE
  // For now, check if this is a real transport socket (not RawTransportSocket)
  if (transport_socket_ &&
      dynamic_cast<RawTransportSocket*>(transport_socket_.get()) == nullptr) {
    auto result = transport_socket_->doRead(read_buffer_);
    return result;
  }

void ConnectionImpl::doWrite() {
  /**
   * CORE WRITE FUNCTION - Writes data from write_buffer_ to socket
   *
   * Flow:
   * 1. Check transport socket for any pending data (e.g., TLS handshake)
   * 2. Write from write_buffer_ to socket
   * 3. Continue writing until buffer empty or socket buffer full (EAGAIN)
   *
   * Called from:
   * - onWriteReady() when socket becomes writable
   * - write() when new data is added and socket is ready
   *
   * Thread safety: All operations in dispatcher thread
   */
  if (state_ != ConnectionState::Open) {
    return;
  }

  // Use transport socket for initial processing if available
  // This is essential for stdio transport which manages pipe bridging
  // TODO: Fix transport socket implementation for HTTP/SSE
  if (transport_socket_ &&
      dynamic_cast<RawTransportSocket*>(transport_socket_.get()) == nullptr) {
    // Let transport process any pending operations
    // For stdio, this ensures the bridge threads are active