Add get-orders-by-address endpoint with DotrainRegistry integration

[findolor]

Motivation

Build out the REST API with full route handlers, request/response types, error handling, Swagger UI, and CORS support. Implement the first functional endpoint (get_orders_by_address) that queries orders from the orderbook subgraph via DotrainRegistry.

Solution

• Replace the hello-world main.rs with a full Rocket web server setup including CORS, Swagger UI, and route mounting
• Add typed request/response structs for all API domains: orders, trades, swap, tokens, health
• Add ApiError type with Rocket responder for structured error responses
• Add validated path parameter types (ValidatedAddress, ValidatedFixedBytes) with alloy primitives
• Implement get_orders_by_address using DotrainRegistry loaded from REGISTRY_URL env var, querying the raindex client for orders by owner address with pagination
• Wrap non-Send DotrainRegistry futures in spawn_blocking + LocalSet to satisfy Rocket's Send requirement
• Stub remaining endpoints with todo!()

Checks

By submitting this for review, I'm confirming I've done the following:

• made this PR as small as possible
• unit-tested any new functionality
• linked any relevant issues or PRs
• included screenshots (if this involves a front-end change)

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch findolor/get-orders-by-address

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}