fix: Update schema.ts for evm in packages

[Rishabhjava]

I added a candidatePools type because the branch throws build errors otherwise when tryign to build as the candidatePools type wasn't defined and defaulted to never.

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PR-Codex overview

This PR adds a new field candidatePools to the schema in packages/smart-router/evm/v3-router/schema.ts.

Detailed summary

• Added candidatePools field to the schema in smart-router/evm/v3-router/schema.ts

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