feat(router-sdk): add maxHopSlippage to Trade.swaps

[kristiehuang]

Description

For maxHopSlippage, a partial implementation exists for multi-hop V4-only routes in UR-sdk, but it is incorrect:

1. Flat array on SwapOptions -- A single maxHopSlippage?: BigNumber[] on SwapOptions cannot correctly map values to specific routes in a split-route trade (e.g. 40% Route A with 3 hops, 60% Route B with 2 hops).
2. Mixed routes pass the full array -- In addMixedSwap, the entire options.maxHopSlippage array is passed to V4 sections without slicing; V2/V3 sections get nothing.

We need to ensure that per-hop slippage is saved per route data model, not per trade (i.e. for split route trades)

This PR adds maxHopSlippage support to the Trade.swaps object in router-sdk, enabling per-hop slippage protection for multi-hop swaps across all route types (V2, V3, V4, and mixed routes)

How Has This Been Tested?

[e.g. Manually, E2E tests, unit tests, Storybook]

Are there any breaking changes?

Purely additive, no breaking changes, no existing code uses the new field yet. Can merge independently.

Follow Ups

• in order to be used in UR-sdk, need to publish minor version bump to router-sdk

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✨ Claude-Generated Content

Summary

Adds maxHopSlippage support to the Trade class in router-sdk, enabling per-hop slippage protection for multi-hop swaps across all route types (V2, V3, V4, and mixed routes).

Changes

• Added optional maxHopSlippage?: bigint[] field to the swaps array type in Trade class
• Extended route input types for V2, V3, V4, and mixed routes to accept maxHopSlippage parameter
• Propagated maxHopSlippage through the constructor for all route types
• Extended fromRoutes() static method to pass maxHopSlippage through populated routes

How Has This Been Tested?

This is a type extension.

Are there any breaking changes?

No - maxHopSlippage is an optional parameter with no changes to existing behavior.

[kristiehuang]

• feat(universal-router-sdk): wire up per-hop slippage encoding #532
• feat(universal-router-sdk): v2.1.1 version rename & ABI structs #531
• feat(breaking): switch v4-sdk from UR v2.1 to UR v2.1.1 & add single-hop ABI struct #530
• feat(router-sdk): add maxHopSlippage to Trade.swaps #529 👈 (View in Graphite)
• main

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