Products: categories and sub-categories become clickable pages

The 2026-11-02 menu build created the 3 categories and 9 sub-categories
as sysfolders (labels); every level must be a clickable page.

- build-product-overviews: six sub-categories adopt the 2026-10 category
  pages (Joe's workbooks; content, slug and SEO kept, sitemap name as
  nav_title), the remaining folders become pages with generated content,
  Capture & Graphics gets the main column of Graphics & Multi-Display and
  Video Capture copied in. Pages move/convert by direct UPDATE (the
  redirects slug hook would rewrite the flat child slugs); three 2026-10
  pages leave the menus but stay reachable. Warns about a sys_redirect
  on a target slug.
- ProvideProductCatalog: categories[].link and groups[].link (additive),
  menu title = nav_title when set, only filled groups/categories count.
  The menu search reads both levels as pages too.
- build-why-vitec-bands: band at the top of the main column; on pages
  with an existing "Why VITEC?" section the context's icons go onto the
  cards whose title matches the icon theme (16 icons on 4 pages).
- No browser cache headers on the page JSON: headless enables
  sendCacheHeaders and TYPO3 14 caches pages for a year by default, so
  every /_json/ response carried max-age=~31536000.
- Spec v1.32.

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

packages/vitec/Configuration/Sets/Vitecset/setup.typoscript

@@ -331,6 +331,17 @@ tt_content {
 page.10.fields.jsonLd = USER
 page.10.fields.jsonLd.userFunc = Evomedien\Vitec\UserFunc\PageJsonLdRenderer->render
 
+# =============================================================================
+# No browser caching of the page JSON (2026-11-05). EXT:headless sets
+# page.config.sendCacheHeaders = 1, and TYPO3 14 caches a page for ONE YEAR
+# by default (CacheLifetimeCalculator::defaultCacheTimeout) - every /_json/
+# response went out with "Cache-Control: max-age=~31536000", so browsers
+# kept an old menu/page for up to a year (found when the clickable product
+# categories did not show up). The server-side page cache is unaffected;
+# without the header, .htaccess sends application/json "access plus 0 seconds".
+# =============================================================================
+page.config.sendCacheHeaders = 0
+
 ############################################################
 # Frontend resolution for the record links from the link
 # browser (page.tsconfig TCEMAIN.linkHandler):