HTTP client for the Telegram Bot API using Req.

Handles JSON and multipart requests, retries, telemetry, and response parsing.

Token handling

The bot token is embedded in the request path (/bot<TOKEN>/<method>) as the Telegram API requires. It is never logged: telemetry metadata carries only the method and params, transport errors surface the reason (not the URL), and Req's retry logging omits the URL. Keep custom telemetry handlers from logging the URL.