Add tutorial: Building ATM withdrawal system with Omni Wallet

[Copilot]

Description

Adds comprehensive tutorial for building a serverless cryptocurrency ATM withdrawal application using Architect and Omni Wallet (Bitcoin/Omni Protocol web wallet).

Changes

New Tutorial (src/views/docs/en/:tutorials/atm-withdraw-omni-wallet.md)

• Project setup with @http, @tables manifest configuration
• DynamoDB schema for users, transactions, wallets
• API endpoints (balance check, withdrawal processing, verification)
• Omni Wallet API integration patterns
• Transaction processing with balance verification and validation
• Security implementations: MFA, rate limiting, key management, encryption
• Deployment configuration and monitoring setup

Integration

• Linked from examples page (src/views/docs/en/guides/examples.md)
• Extended spellcheck dictionary with cryptocurrency/ATM terminology

Example Usage

// GET /api/balance - uses query parameters
export async function handler(event) {
  const { walletAddress } = event.queryStringParameters || {}
  const balance = await getBalance(walletAddress)
  return {
    statusCode: 200,
    body: JSON.stringify({ walletAddress, balance, currency: 'BTC' })
  }
}

Screenshot

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Checklist

• Forked the repo and created your branch from main
• Made sure tests pass (run npm it from the repo root)
• Updated relevant documentation internal to this repo (e.g. readme.md, help docs, inline docs & comments, etc.)
• Linked to any related issues, PRs, etc. below that may relate to, consume, or necessitate these changes

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