Turn prerendering back on

[pierosavi]

Closes OHF-Device-Database/backlog-items#169.

PR #39 switched the whole site to server rendering because prerendering broke translations: at build time there is no request URL to read the locale from, so every prerendered page came out in English. This PR prerenders the four content pages again, one static file per locale, and keeps everything else server-rendered.

What is prerendered now

Route	Rendering	Why
/about, /how-it-works, /editorial-stance, /imprint (+ /de/..., /fr/..., all 31 locales)	prerendered	pure content, no API or query params
/, /browse, /devices/[id]	server	need the device API at request time
/surveys	server	active edition comes from ?survey=
/404, /robots.txt, /config.js	server	read the request URL or runtime env

How it works

• Pages moved to src/pages/[...locale]/. The optional [...locale] segment is the language prefix. /about is English (no prefix), /de/about is German. Prerendered pages list their locales via getStaticPaths (localeStaticPaths in src/utilities/locale.ts), so the build writes one HTML file per locale.
• Middleware hands the URL to Paraglide. Paraglide reads the locale from the request URL, which works both at request time and at build time . One workaround: Astro's build-time request warns when its headers are read and Paraglide reads Sec-Fetch-Dest, so at build time we pass a bare new Request(context.url) instead.
• Invalid prefixes 404. /en/about, /foo/about, /de/nonexistent render the localized 404 page.
• Runtime env vs. static files. Prerendered pages are frozen at build time, so they can't read NOINDEX or CSR_API_AUTHORITY from the container's env. Two consequences:
  • The client-side API authority is served by a new server-rendered /config.js endpoint instead of being inlined into the HTML. src/io/index.ts reads it per call instead of at module load.
  • Prerendered pages carry no robots meta tag or X-Robots-Tag header. robots.txt (server-rendered, reads the runtime NOINDEX) remains the crawl gate for preview deploys.
• build.format: "file" + trailingSlash: "never". Prerendered pages are written as about.html, not about/index.html. With the directory layout Netlify redirected every /about link to /about/. /about/ now redirects to /about on both Netlify and the node target.

Things to keep in mind

• A new prerendered page needs export const getStaticPaths = localeStaticPaths;. A page that needs the API or query params needs export const prerender = false;.
• Prerendered pages must only emit relative URLs (localizeHref("/about")), never absolute ones: there is no real origin at build time.
• Astro.cache.set() was dropped from the prerendered pages, static files don't need it.

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