Merge pull request #179 from lsb11/patch-3

Update README-EN.md

README-EN.md

@@ -248,6 +248,7 @@ Feel free to submit PRs and issues to update the content. If you have any questi
 | [Flashify](https://flashify.app?utm_source=github&utm_medium=directory&utm_campaign=backlink-2026q1) | AI-powered study platform that converts PDFs into high-quality Anki flashcards with export-ready decks. | <https://flashify.app?utm_source=github&utm_medium=directory&utm_campaign=backlink-2026q1> | Maintaining |
 | [OmniConvert](https://github.com/s87343472/omni-convert) | Free online conversion toolbox deployed on Cloudflare Pages + Workers. Supports file conversion, unit conversion, PWA, multilingual UI, and API/MCP access. | <https://tools.sagasu.art> | Maintaining |
 | [Dualmark](https://github.com/dodopayments/dualmark) | Open-source AEO (Answer Engine Optimization) infrastructure. The `@dualmark/cloudflare` adapter wraps any upstream Worker and serves clean Markdown twins to AI crawlers (GPTBot, ClaudeBot, PerplexityBot, +16 more known UAs) at the edge via HTTP content negotiation, while humans get HTML — same URL, two formats. Apache 2.0, npm provenance attested. | <https://dualmark.dev> | Maintaining |
+| [shopify-attribution-gap-backend](https://github.com/lsb11/shopify-attribution-gap-backend) | Edge data-collection backend on Cloudflare Workers + D1 for an open Shopify iOS attribution-gap benchmark. Server-side gap computation, manual review gate, median aggregation, no server needed. | <https://stackarchitect.xyz/shopify-ios-attribution-gap-benchmark/> | Maintaining |
 
 
 ## Tutorials