init

[rouzwelt]

Motivation

Caution

Do NOT merge before #427

This PR implements solving for routed Raindex orders through Raindex router arb contract:

• order A/B -> B/C (sushi) -> order C/A

Solution

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)

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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 2026-01-30-raindex-router-mode

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