feat(storefront): section-based homepages, header action partials, fixes

Phase 1 — Section-based store homepages:
- Store defaults use template="full" with per-platform sections JSON
- OMS: shop hero + features + CTA; Loyalty: rewards hero + features + CTA
- Hosting: services hero + features + CTA
- Deep placeholder resolution for {{store_name}} inside sections JSON
- landing-full.html uses resolved page_sections from context

Phase 2 — Module-contributed header actions:
- header_template field on MenuItemDefinition + DiscoveredMenuItem
- Catalog provides header-search.html partial
- Cart provides header-cart.html partial with badge
- Base template iterates storefront_nav.actions with {% include %}
- Generic icon fallback for actions without a template

Fixes:
- Store theme API: get_store_by_code → get_store_by_code_or_subdomain

Docs:
- CMS redesign proposal: menu restructure, page types, translations UI

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/cart/definition.py

@@ -72,6 +72,7 @@ cart_module = ModuleDefinition(
                         icon="shopping-cart",
                         route="cart",
                         order=20,
+                        header_template="cart/storefront/partials/header-cart.html",
                     ),
                 ],
             ),

app/modules/cart/templates/cart/storefront/partials/header-cart.html

@@ -0,0 +1,10 @@
+{# cart/storefront/partials/header-cart.html #}
+{# Cart icon with badge for storefront header — provided by cart module #}
+<a href="{{ base_url }}cart" class="relative p-2 rounded-lg hover:bg-gray-100 dark:hover:bg-gray-700">
+    <span class="w-5 h-5" x-html="$icon('shopping-cart', 'w-5 h-5')"></span>
+    <span x-show="cartCount > 0"
+          x-text="cartCount"
+          class="absolute -top-1 -right-1 bg-accent text-white text-xs rounded-full h-5 w-5 flex items-center justify-center"
+          style="background-color: var(--color-accent)">
+    </span>
+</a>