feat: shop 4-section category banners + brand-feedback pass

Shop page rebuilt into four brand colour-coded use-group sections (Küche/lime,
Reinigung/grapefruit, Wäsche/plum, Pflege/care/orange): colour banners with diagonal
dividers, per-section grid titles, crimson 'add to cart' + white-outline 'learn more'
CTAs, plain-name eyebrows, first-fold halved + thin white band. Split old Haushalt
group into clean+wash.

Also in this checkpoint (brand-owner feedback items):
- L11: Kaiser-Natron® on every visible mention, hyphenated (de+en, products, logo, nav)
- L4: product-hero headline reworded to the brand versatility voice
- L5/L6: faint 'AI Edited' badge on AI bundle images (data-driven aiEdited flag)
- L10: Revitalization animation row + early-access CTA removed
- U2: membership 'become a member' button removed
- New category tokens (cat-kitchen/clean/wash/care) + Hero/WaveDivider tones
- New /kueche category page (route + copy) — not yet linked (see STYLE-CHANGES caveat)
- Homepage reverted to original ProductTeaser (banners belong on /shop)

dist/ rebuilt and included for the Portainer/gitea deploy. Open decisions tracked
in STYLE-CHANGES.md §20 and memory.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/router/index.js

@@ -91,6 +91,13 @@ const routes = [
     props: { slug: 'haushalt', useCase: 'clean' },
     meta: { layout: 'none' },
   },
+  {
+    path: '/kueche',
+    name: 'kueche',
+    component: () => import('@/pages/CategoryPage.vue'),
+    props: { slug: 'kueche', useCase: 'cook' },
+    meta: { layout: 'none' },
+  },
   {
     path: '/impressum',
     name: 'impressum',