Portfolio without downloads; Om mig, Kontakt and Posters come from the portal on the same domain

Linus 2026-11-06: everything public lives on imagesbyolofsson.se (Cleura), the customer
subdomain is only for ordering and the logged-in portal; photos are sold as posters
instead of being downloadable.

- Portfolio: download menu (S/M/L), the original password dialog and /download/original
  are gone; the lightbox has "Köp som poster" -> /posters instead.
- about.astro and contact.astro removed: Caddy on Cleura sends /about, /contact and
  /posters to the portal, so the About text and collaborations are edited once in admin.
  They stay in sitemap-0.xml (PORTAL_PAGES); the sitemap index lists /posters/sitemap.xml.
- Menu and 404 page link Posters; privacy, robots.txt and llms.txt no longer mention
  password downloads.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

public/robots.txt

@@ -8,8 +8,6 @@
 
 User-agent: *
 Allow: /
-# Lösenordsskyddad nedladdning av originalfiler – inget att indexera.
-Disallow: /download/
 
 # AI-crawlers och träningsbotar: uttryckligen tillåtna.
 User-agent: GPTBot
@@ -36,6 +34,5 @@ User-agent: YouBot
 User-agent: DuckAssistBot
 User-agent: MistralAI-User
 Allow: /
-Disallow: /download/
 
 Sitemap: https://imagesbyolofsson.se/sitemap-index.xml