Astro Guideline: Routing — Enable SSR when needed. Description: Server-side rendering for dynamic content. Do: output: 'server' or 'hybrid' for dynamic. Don't: SSR for purely static sites. Good Example: export const prerender = false;. Bad Example: SSR for static blog. Severity: Medium. Docs: https://docs.astro.build/en/guides/server-side-rendering/.