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/routes/pages/platform.py

@@ -164,46 +164,13 @@ async def homepage(
         logger.info(f"[HOMEPAGE] Rendering CMS homepage with template: {template_path}")
         return templates.TemplateResponse(template_path, context)
 
-    # Fallback: Default orion homepage (no CMS content)
-    logger.info("[HOMEPAGE] No CMS homepage found, using default orion template")
+    # Fallback: Default homepage template with placeholder content
+    logger.info("[HOMEPAGE] No CMS homepage found, using default template with placeholders")
     context = get_platform_context(request, db)
     context["tiers"] = _get_tiers_data(db)
 
-    # Add-ons (hardcoded for now, will come from DB)
-    context["addons"] = [
-        {
-            "code": "domain",
-            "name": "Custom Domain",
-            "description": "Use your own domain (mydomain.com)",
-            "price": 15,
-            "billing_period": "year",
-            "icon": "globe",
-        },
-        {
-            "code": "ssl_premium",
-            "name": "Premium SSL",
-            "description": "EV certificate for trust badges",
-            "price": 49,
-            "billing_period": "year",
-            "icon": "shield-check",
-        },
-        {
-            "code": "email",
-            "name": "Email Package",
-            "description": "Professional email addresses",
-            "price": 5,
-            "billing_period": "month",
-            "icon": "mail",
-            "options": [
-                {"quantity": 5, "price": 5},
-                {"quantity": 10, "price": 9},
-                {"quantity": 25, "price": 19},
-            ],
-        },
-    ]
-
     return templates.TemplateResponse(
-        "cms/platform/homepage-orion.html",
+        "cms/platform/homepage-default.html",
         context,
     )
 

app/modules/cms/routes/pages/storefront.py

@@ -101,9 +101,17 @@ async def generic_content_page(
         },
     )
 
+    # Resolve placeholders in store default pages ({{store_name}}, etc.)
+    page_content = page.content
+    if page.is_store_default and store:
+        page_content = content_page_service.resolve_placeholders(page.content, store)
+
+    context = get_storefront_context(request, db=db, page=page)
+    context["page_content"] = page_content
+
     return templates.TemplateResponse(
         "cms/storefront/content-page.html",
-        get_storefront_context(request, db=db, page=page),
+        context,
     )