fix: relay transaction fees

[matthewwalsh0]

Explanation

Determine Relay provider fees directly from data with no calculation.

References

Related to #6186

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

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Note

Read provider fees directly from Relay response (fees.relayer.amountUsd) and update quote normalization, types, and tests accordingly.

• Relay strategy
  • Fee source: Use fees.relayer.amountUsd for provider fee in normalizeQuote instead of deriving from details.
  • Types: Update RelayQuote to remove details.currencyIn and replace fees.gas with fees.relayer in src/strategy/relay/types.ts.
  • Normalization: Adjust provider fee calculation in src/strategy/relay/relay-quotes.ts.
• Tests
  • Update relay-quotes.test.ts mocks and expectations to align with new fees.relayer structure and provider fee calculation.
• Changelog
  • Add entry: Read Relay provider fees directly from response.

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