LOOPIN-023 — Deploy backend

[shaig-mahmudov]

• Type: DevOps
• Priority: High
• Branch: devops/LOOPIN-023-deploy-backend-render
• Description: Deploy Spring Boot application to Render and map the production environment variables and database connections.
• Acceptance Criteria:
  • Production database is connected.
  • Health check or Swagger endpoint is accessible.
  • CORS policies permit the frontend production domain.