Long polling guide

Use `offset`, `limit`, and `timeout`. The server returns updates with `update_id > offset`. With `timeout > 0`, the request waits for new updates up to the given limit.

curl -H "Authorization: Bearer <bot_token>" \
  "https://api.yullama.ru/v1/bot-api/updates?offset=0&limit=50&timeout=30"

Acknowledgement is client-driven through the next `offset`. If you processed update `41`, the next request should use at least `offset=41`. Bot API will then not return that row again.

Persist `lastSeenUpdateID`, advance it only after successful handling, and keep polling immediately. If your handler crashes mid-batch, do not move the offset past the last confirmed update.

let offset = loadOffset();
for (;;) {
  const { items } = await client.bot.getUpdates({ offset, limit: 50, timeout: 30 });
  for (const item of items) {
    await handleUpdate(item);
    offset = item.update_id;
  }
}