Telegraf Mixpanel

Mixpanel analytics middleware for the Telegraf Telegram bot framework. Current version 1.0.0. Provides a simple way to track events, set people properties, and manage charges directly from Telegraf context via `ctx.mixpanel`. Requires Telegraf v2 or v3. Lightweight wrapper around the Mixpanel Node.js library, designed for bot-specific analytics workflows like sales funnels. No breaking changes yet; limited to single Mixpanel instance per bot.