fix(api): return fixed discounts in major units

[charlietlamb]

Summary

• convert Stripe amount_off values to Autumn major currency units in expanded customer rewards
• keep percentage discount values unchanged
• add an integration regression test covering a $250 customer-level coupon

Testing

• bunx tsgo --build --noEmit
• red: customer API returned 25000 instead of 250
• green: ./run.sh .../customer-fixed-discount-major-units.test.ts — 1 pass, 0 fail

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Summary by cubic

Fix the customer rewards API to return fixed-discount coupon amounts in Autumn major currency units (e.g., $250 => 250, not 25000). Percentage discounts are unchanged.

^{Written for commit b25ee93. Summary will update on new commits.}

Greptile Summary

Converts fixed Stripe coupon amounts from minor units into Autumn’s major currency units while leaving percentage discounts unchanged.

• [Bug fixes, API changes] Normalizes expanded customer fixed-discount values using the coupon currency.
• [Improvements] Adds an integration regression test for a $250 customer-level coupon.

Confidence Score: 5/5

The PR appears safe to merge with no actionable defects identified.

The response conversion mirrors the existing major-to-minor Stripe coupon creation path, preserves percentage discounts, and is covered by a focused customer API regression test.

Important Files Changed

Filename	Overview
server/src/internal/customers/cusUtils/cusResponseUtils/getCusRewards.ts	Correctly applies the shared currency-aware minor-to-major unit conversion to fixed discounts without changing percentage values.
server/tests/integration/customers/rewards/customer-fixed-discount-major-units.test.ts	Adds focused regression coverage confirming that a $250 fixed coupon is returned as 250 rather than 25000.

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