fix: remove incorrect cents-to-dollars conversion in notification currency formatting

[devin-ai-integration]

Summary

Order confirmation notification emails were displaying wrong amounts (e.g. a $149.99 order showed as $1.50).

Root cause: NotificationRenderer.FormatCurrency() divided the amount by 100, assuming TotalAmount was transmitted in cents. In reality, the OrderPlacedEvent contract and the entire pipeline (OrderPlacedEventDto → OrderPlacedEvent → OrderNotification.OrderTotal) pass the amount in dollars as a decimal. The erroneous / 100m turned 149.99 into 1.4999, which rounded to $1.50.

Fix: Remove the /100m division and format the dollar amount directly.

Also fixes broken ProjectReference paths in Notification.API.csproj — the relative paths to Shared.Contracts and Shared.Infrastructure were one level short (../../ instead of ../../../), preventing the project from building locally.

Before / After

Before (bug)	After (fix)

Review & Testing Checklist for Human

• Verify no other producer sends TotalAmount in cents. The fix assumes all publishers of OrderPlacedEvent use dollars. If any upstream service (e.g. Order service) actually converts to cents before publishing, this fix would be wrong for that flow. Check the Order service's event publishing code.
• Reproduce locally: POST to /api/notification/events/order-placed with {"orderId":"11111111-1111-1111-1111-111111111111","customerId":"22222222-2222-2222-2222-222222222222","totalAmount":149.99,"placedAt":"2026-03-17T12:00:00Z"} and open the preview URL — total should read $149.99.
• Consider adding a unit test for FormatCurrency / RenderNotification to prevent regression.

Notes

• The ToString("C2") formatting is locale-dependent (pre-existing, not introduced here). On non-US locales the currency symbol may differ. If consistent $ formatting is needed, consider using CultureInfo.InvariantCulture or a US culture explicitly.
• The .csproj path fix is a pre-existing build issue unrelated to the currency bug but was necessary to build and test locally.

Link to Devin session: https://partner-workshops.devinenterprise.com/sessions/5c6f1dc44e6b4a1a92276d817d9c5d9c

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[devin-ai-integration]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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