add email flows

backend/src/main/resources/application.yml

@@ -50,6 +50,11 @@ springdoc:
 app:
   upload:
     base-dir: ${UPLOAD_BASE_DIR:uploads}
+  frontend-url: ${FRONTEND_URL:http://localhost:3000}
+
+resend:
+  api-key: ${RESEND_API_KEY:}
+  from: ${RESEND_FROM:PetShop <onboarding@resend.dev>}
 
 jwt:
   secret: ${JWT_SECRET}