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/cms/routes/pages/storefront.py

@@ -60,12 +60,14 @@ async def storefront_homepage(
         include_unpublished=False,
     )
 
-    # Resolve placeholders for store default pages (title + content)
+    # Resolve placeholders for store default pages (title, content, sections)
     page_content = None
     page_title = None
+    page_sections = None
     if page:
         page_content = page.content
         page_title = page.title
+        page_sections = page.sections
         if page.is_store_default and store:
             page_content = content_page_service.resolve_placeholders(
                 page.content, store
@@ -73,12 +75,18 @@ async def storefront_homepage(
             page_title = content_page_service.resolve_placeholders(
                 page.title, store
             )
+            if page_sections:
+                page_sections = content_page_service.resolve_placeholders_deep(
+                    page_sections, store
+                )
 
     context = get_storefront_context(request, db=db, page=page)
     if page_content:
         context["page_content"] = page_content
     if page_title:
         context["page_title"] = page_title
+    if page_sections:
+        context["page_sections"] = page_sections
 
     # Select template based on page.template field (or default)
     template_map = {

app/modules/cms/services/content_page_service.py

@@ -24,6 +24,7 @@ Lookup Strategy for Store Storefronts:
 
 import logging
 from datetime import UTC, datetime
+from typing import Any
 
 from sqlalchemy import and_
 from sqlalchemy.orm import Session
@@ -991,6 +992,28 @@ class ContentPageService:
             content = content.replace(placeholder, value)
         return content
 
+    @staticmethod
+    def resolve_placeholders_deep(data, store) -> Any:
+        """
+        Recursively resolve {{store_name}} etc. in a nested data structure
+        (dicts, lists, strings). Used for sections JSON in store default pages.
+        """
+        if not data or not store:
+            return data
+        if isinstance(data, str):
+            return ContentPageService.resolve_placeholders(data, store)
+        if isinstance(data, dict):
+            return {
+                k: ContentPageService.resolve_placeholders_deep(v, store)
+                for k, v in data.items()
+            }
+        if isinstance(data, list):
+            return [
+                ContentPageService.resolve_placeholders_deep(item, store)
+                for item in data
+            ]
+        return data
+
     # =========================================================================
     # Homepage Sections Management
     # =========================================================================

app/modules/cms/services/store_theme_service.py

@@ -70,7 +70,7 @@ class StoreThemeService:
         """
         from app.modules.tenancy.services.store_service import store_service
 
-        store = store_service.get_store_by_code(db, store_code)
+        store = store_service.get_store_by_code_or_subdomain(db, store_code)
 
         if not store:
             self.logger.warning(f"Store not found: {store_code}")

app/modules/cms/templates/cms/storefront/landing-full.html

@@ -14,7 +14,8 @@
 {# SECTION-BASED RENDERING (when page.sections is configured)         #}
 {# Used by POC builder templates — takes priority over hardcoded HTML #}
 {# ═══════════════════════════════════════════════════════════════════ #}
-{% if page and page.sections %}
+{% set sections = page_sections if page_sections is defined and page_sections else (page.sections if page else none) %}
+{% if sections %}
 {% from 'cms/platform/sections/_hero.html' import render_hero %}
 {% from 'cms/platform/sections/_features.html' import render_features %}
 {% from 'cms/platform/sections/_testimonials.html' import render_testimonials %}
@@ -26,12 +27,12 @@
 {% set default_lang = 'fr' %}
 
 <div class="min-h-screen">
-    {% if page.sections.hero %}{{ render_hero(page.sections.hero, lang, default_lang) }}{% endif %}
-    {% if page.sections.features %}{{ render_features(page.sections.features, lang, default_lang) }}{% endif %}
-    {% if page.sections.testimonials %}{{ render_testimonials(page.sections.testimonials, lang, default_lang) }}{% endif %}
-    {% if page.sections.gallery %}{{ render_gallery(page.sections.gallery, lang, default_lang) }}{% endif %}
-    {% if page.sections.contact_info %}{{ render_contact_info(page.sections.contact_info, lang, default_lang) }}{% endif %}
-    {% if page.sections.cta %}{{ render_cta(page.sections.cta, lang, default_lang) }}{% endif %}
+    {% if sections.hero %}{{ render_hero(sections.hero, lang, default_lang) }}{% endif %}
+    {% if sections.features %}{{ render_features(sections.features, lang, default_lang) }}{% endif %}
+    {% if sections.testimonials %}{{ render_testimonials(sections.testimonials, lang, default_lang) }}{% endif %}
+    {% if sections.gallery %}{{ render_gallery(sections.gallery, lang, default_lang) }}{% endif %}
+    {% if sections.contact_info %}{{ render_contact_info(sections.contact_info, lang, default_lang) }}{% endif %}
+    {% if sections.cta %}{{ render_cta(sections.cta, lang, default_lang) }}{% endif %}
 </div>
 
 {% else %}