feat: add cowswap affiliate tracking

[premiumjibles]

Summary

This adds butterswap to our affiliate revenue tracker. The implementation is a bit of a best effort hack until we get a proper API from butter. It just queries the approximate block at the start and end of your time period, looks at total affiliate fees and takes the diff.

Testing

• Make sure unchained ain't dead

If you want to properly test this locally:

1. Install dependencies (from repo root) cd /home/sean/Repos/shapeshift-unchained yarn install

2. Copy and configure env cp node/proxy/sample.env node/proxy/.env // Edit node/proxy/.env with real API keys (BEBOP_API_KEY, ZRX_API_KEY, etc.)

3. Start reverse proxy (from repo root) docker-compose up -d reverse-proxy

4. Start proxy API cd node/proxy docker-compose up

5. Test endpoint (in another terminal)

curl "http://api.proxy.localhost/api/v1/affiliate/revenue?startTimestamp=1764547200&endTimestamp=1767225600"

Screenshots

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✨ Finishing touches

🧪 Generate unit tests (beta)

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment
• [ ] Commit unit tests in branch 11439_cowswap_tracker

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