SSR is useful when a marketing-site response depends on the request, requires protected previews or dynamic data, or processes forms server-side. I enable server mode selectively rather than turning all content into a heavy application.

Scope includes form handlers, server validation, spam protection, email or CRM delivery, lightweight APIs, and environment setup. A full portal, complex roles, or long background processes belong in a web application. Acceptance tests valid and invalid submissions, duplicate handling, server-only secrets, meaningful HTML without mandatory JavaScript, and preview access controls.