Ship Print Forge shop site (colors, photos, 3D viewer) (#2)

## Summary

- Rebrand the Django client template as Print Forge (`client_site` → `print_forge`) with shop + shipping enabled.
- Product listings support multiple photos, color variants (shared price/description/STL, per-color stock and photos), and a photo-first / 3D-second gallery.
- Public pages use 3D printer / printed-toy photography instead of leftover t-shirt mockups; beta CI deploys on `master`.

Closes #1
Infra: [server-infra#27](ai_ml_operations/server-infra#27) (easy deploy beta).

## Test plan

- [ ] Product page shows photo first, 3D model second; color swatches swap photos and stock
- [ ] Portal can upload multiple photos and per-color qty/images; STL stays shared
- [ ] Public home/about/gallery have no t-shirt mockups
- [ ] `manage.py test` passes
- [ ] After server-infra#27: beta deploy to `print-forge-preview.aimloperations.com`

Reviewed-on: #2

site/public/views.py

@@ -29,7 +29,18 @@ def _public_site_base(request) -> str:
 
 
 def home(request):
-    return render(request, "public/home.html")
+    featured = []
+    from django.apps import apps as django_apps
+
+    if django_apps.is_installed("shop"):
+        from shop.models import Product
+
+        featured = list(
+            Product.objects.filter(is_published=True)
+            .select_related("image")
+            .prefetch_related("colors")[:6]
+        )
+    return render(request, "public/home.html", {"featured_products": featured})
 
 
 def about(request):
@@ -70,6 +81,10 @@ def sitemap_xml(request):
     from django.apps import apps as django_apps
     if django_apps.is_installed("blog"):
         paths.append(("blog:list", "0.7", "weekly"))
+    if django_apps.is_installed("shop"):
+        paths.append(("shop:list", "0.8", "weekly"))
+    if django_apps.is_installed("events"):
+        paths.append(("events:list", "0.8", "weekly"))
     urls = []
     for name, priority, changefreq in paths:
         path = reverse(name)