feat: add telegram-mini-app-smart-wallet-guide

[jadonamite]

Summary

Adds a cookbook guide for building a Telegram Mini App integrated with Coinbase Smart Wallet on Base.

Content

• Author: @jadonamite
• Stack: Next.js, Telegraf (Node.js), OnchainKit, Telegram Apps SDK.
• Key Features:
  • Bot setup for serving the Web App button.
  • Frontend configuration for smartWalletOnly connection preference (Passkeys).
  • Proper Provider wrapping to handle Telegram's window object injection.

Objective

Telegram has 900M users. Combining its distribution with Base's low fees and Smart Wallet's easy onboarding (no seed phrases) is a massive unlock for consumer crypto apps.

Verification

• Verified Bot command /start launches the Web App.
• Verified OnchainKit connects successfully within the Telegram Web View on iOS/Android.
• Verified Vercel deployment compatibility.

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1