fix: correct currency formatting in notification email previews

[devin-ai-integration]

Summary

Fixes a bug where order confirmation notification emails displayed incorrect amounts after the microservice decomposition. A $149.99 order was showing as $1.50 in the email preview.

Root Cause

The NotificationRenderer.FormatCurrency method in the notification-service incorrectly divided the order total by 100, based on an erroneous comment claiming that OrderPlacedEvent.TotalAmount is "transmitted in cents." In reality, the shared OrderPlacedEvent contract (Shared.Contracts/Events/OrderPlacedEvent.cs) defines TotalAmount as a decimal representing dollars, not cents.

// BEFORE (buggy) — divides dollars by 100, yielding $1.50 for a $149.99 order
var dollars = amount / 100m;
return dollars.ToString(\"C2\");

// AFTER (fixed) — formats the amount directly
return amount.ToString(\"C2\");

This also fixes broken project references to the Shared.Contracts and Shared.Infrastructure libraries (incorrect relative path depth prevented the notification-service from building independently).

Before / After

Before (Bug)	After (Fix)

Review & Testing Checklist for Human

• Run the notification-service locally and POST to http://localhost:5005/api/notification/events/order-placed with {\"totalAmount\": 149.99, ...} — verify the preview shows $149.99
• Confirm that the OrderPlacedEvent.TotalAmount contract is consistently used as dollars (not cents) across all producing services
• Verify the corrected project references allow dotnet build to succeed from the Notification.API directory

Notes

• The generic currency symbol (¤) appears in the preview because the server runs with invariant culture; in production with en-US locale, it will render as $149.99.
• The broken project references (..\\..\\Shared\\ → ..\\..\\..\\Shared\\) were a pre-existing issue from the decomposition scaffolding that prevented local builds.

Link to Devin session: https://partner-workshops.devinenterprise.com/sessions/7fd8885c2b024624835c9f4d1ec825d5
Requested by: @DhrovS

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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.

View in Devin Review to see 2 additional findings.