전체 코드, 구조 검토 - P1-6 코드 수정 진행

app/api/upgrade-requests/[id]/route.ts

@@ -40,7 +40,7 @@ export const PATCH = withApiHandler<{ id: string }>(
         id: maestroUpgradeID,
         duration: Date.now() - t0,
       });
-      void sendUpgradeDoneEmail(
+      const emailSent = await sendUpgradeDoneEmail(
         result.maestroName,
         result.maestroEmail,
         result.registeredActivateStatus,
@@ -48,7 +48,7 @@ export const PATCH = withApiHandler<{ id: string }>(
         result.requestedAccountType,
         formatDate(result.availableActivateDateTime)
       );
-      return NextResponse.json({ ok: true, availableActivateDateTime: result.availableActivateDateTime });
+      return NextResponse.json({ ok: true, availableActivateDateTime: result.availableActivateDateTime, emailSent });
     }
 
     await rejectUpgradeRequest(maestroUpgradeID);