feat(cms): CMS-driven homepages, products section, placeholder resolution

- Add ProductCard/ProductsSection schema and _products.html section macro
- Rewrite seed script with 3-platform homepage sections (wizard, OMS, loyalty),
  platform marketing pages, and store defaults with {{store_name}} placeholders
- Add resolve_placeholders() to ContentPageService for store default pages
- Fix SQLAlchemy filter bugs: replace Python `is None` with `.is_(None)` across
  all ContentPageService query methods (was silently breaking all platform page lookups)
- Remove hardcoded orion fallback and delete homepage-orion.html
- Add placeholder hint box with click-to-copy in admin content page editor
- Export ProductCard/ProductsSection from cms schemas __init__

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/cms/services/content_page_service.py

@@ -142,8 +142,8 @@ class ContentPageService:
             db.query(ContentPage)
             .filter(
                 and_(
-                    ContentPage.store_id is None,
-                    ContentPage.is_platform_page == False,
+                    ContentPage.store_id.is_(None),
+                    ContentPage.is_platform_page.is_(False),
                     *base_filters,
                 )
             )
@@ -182,12 +182,12 @@ class ContentPageService:
         filters = [
             ContentPage.platform_id == platform_id,
             ContentPage.slug == slug,
-            ContentPage.store_id is None,
-            ContentPage.is_platform_page == True,
+            ContentPage.store_id.is_(None),
+            ContentPage.is_platform_page.is_(True),
         ]
 
         if not include_unpublished:
-            filters.append(ContentPage.is_published == True)
+            filters.append(ContentPage.is_published.is_(True))
 
         page = db.query(ContentPage).filter(and_(*filters)).first()
 
@@ -255,8 +255,8 @@ class ContentPageService:
             db.query(ContentPage)
             .filter(
                 and_(
-                    ContentPage.store_id is None,
-                    ContentPage.is_platform_page == False,
+                    ContentPage.store_id.is_(None),
+                    ContentPage.is_platform_page.is_(False),
                     *base_filters,
                 )
             )
@@ -298,12 +298,12 @@ class ContentPageService:
         """
         filters = [
             ContentPage.platform_id == platform_id,
-            ContentPage.store_id is None,
-            ContentPage.is_platform_page == True,
+            ContentPage.store_id.is_(None),
+            ContentPage.is_platform_page.is_(True),
         ]
 
         if not include_unpublished:
-            filters.append(ContentPage.is_published == True)
+            filters.append(ContentPage.is_published.is_(True))
 
         if footer_only:
             filters.append(ContentPage.show_in_footer == True)
@@ -377,12 +377,12 @@ class ContentPageService:
         """
         filters = [
             ContentPage.platform_id == platform_id,
-            ContentPage.store_id is None,
-            ContentPage.is_platform_page == False,
+            ContentPage.store_id.is_(None),
+            ContentPage.is_platform_page.is_(False),
         ]
 
         if not include_unpublished:
-            filters.append(ContentPage.is_published == True)
+            filters.append(ContentPage.is_published.is_(True))
 
         return (
             db.query(ContentPage)
@@ -845,13 +845,13 @@ class ContentPageService:
             filters.append(ContentPage.is_published == True)
 
         if page_tier == "platform":
-            filters.append(ContentPage.is_platform_page == True)
-            filters.append(ContentPage.store_id is None)
+            filters.append(ContentPage.is_platform_page.is_(True))
+            filters.append(ContentPage.store_id.is_(None))
         elif page_tier == "store_default":
-            filters.append(ContentPage.is_platform_page == False)
-            filters.append(ContentPage.store_id is None)
+            filters.append(ContentPage.is_platform_page.is_(False))
+            filters.append(ContentPage.store_id.is_(None))
         elif page_tier == "store_override":
-            filters.append(ContentPage.store_id is not None)
+            filters.append(ContentPage.store_id.isnot(None))
 
         return (
             db.query(ContentPage)
@@ -958,6 +958,34 @@ class ContentPageService:
         if not success:
             raise ContentPageNotFoundException(identifier=page_id)
 
+    # =========================================================================
+    # Placeholder Resolution (for store default pages)
+    # =========================================================================
+
+    @staticmethod
+    def resolve_placeholders(content: str, store) -> str:
+        """
+        Replace {{store_name}}, {{store_email}}, {{store_phone}} placeholders
+        in store default page content with actual store values.
+
+        Args:
+            content: HTML content with placeholders
+            store: Store object with name, contact_email, phone attributes
+
+        Returns:
+            Content with placeholders replaced
+        """
+        if not content or not store:
+            return content or ""
+        replacements = {
+            "{{store_name}}": store.name or "Our Store",
+            "{{store_email}}": getattr(store, "contact_email", "") or "",
+            "{{store_phone}}": getattr(store, "phone", "") or "",
+        }
+        for placeholder, value in replacements.items():
+            content = content.replace(placeholder, value)
+        return content
+
     # =========================================================================
     # Homepage Sections Management
     # =========================================================================
@@ -1032,10 +1060,12 @@ class ContentPageService:
             FeaturesSection,
             HeroSection,
             PricingSection,
+            ProductsSection,
         )
 
         SECTION_SCHEMAS = {
             "hero": HeroSection,
+            "products": ProductsSection,
             "features": FeaturesSection,
             "pricing": PricingSection,
             "cta": CTASection,