Apple App Store Scraper

I want to use the Apple App Store Scraper service on Fast Marketplace.

## Setup (skip if you already have Fast Marketplace set up)
1. Open the marketplace skill: https://marketplace.fast.xyz/skill.md
2. Fund a Fast wallet on mainnet.
3. Provide a search term and optional country, category, or chart filters.
4. Keep the returned job token and poll the marketplace job route for completion.

## Available Endpoints

### Search Apps ($0.0001 USDC)
curl -X POST "https://api.marketplace.fast.xyz/api/apify-appstore/search-apps" \
  -H "Content-Type: application/json" \
  -d '{
  "chart": "top-free",
  "limit": 25,
  "country": "us",
  "searchTerm": "budget planner"
}'

Use this for iOS app discovery, chart monitoring, and metadata enrichment.

For paid endpoints: the first call returns 402. Authorize payment with your Fast wallet and retry with the payment signature header.