Create new instance for fee calculation (backport #3051)

[mergify]

Changelist

• Fix issue with fee calculation for ORRS

Test Plan

• Test cases

Author/Reviewer Checklist

• If this PR has changes that result in a different app state given the same prior state and transaction list, manually add the state-breaking label.
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• If this PR is one of many that implement a specific feature, manually label them all feature:[feature-name].
• If you wish to for mergify-bot to automatically create a PR to backport your change to a release branch, manually add the label backport/[branch-name].
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Summary by CodeRabbit

• Bug Fixes

  • Prevented unintended mutation of net fees during revenue-share calculations by using mutation‑safe copies and adjusting subtraction logic; added a post‑aggregation validation that logs and aborts if total shared fees exceed net fees.

• Tests

  • Added comprehensive tests covering taker/maker order‑router rev shares, unconditional rev shares, maker rebates, and affiliate‑whitelist interactions to validate aggregation, allocation, and edge cases.

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This is an automatic backport of pull request #3051 done by [Mergify](https://mergify.com).

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