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/dashboard/templates/dashboard/home.html

@@ -27,6 +27,36 @@
     <div class="value">{{ open_invoices|default:0 }}</div>
   </div>
   {% endif %}
+  {% if 'shop' in enabled_features %}
+  <div class="stat-card">
+    <div class="label">Open shop orders</div>
+    <div class="value">{{ open_shop_orders|default:0 }}</div>
+  </div>
+  <div class="stat-card">
+    <div class="label">Sales (30 days)</div>
+    <div class="value">{{ shop_sales_30d|default:0 }}</div>
+  </div>
+  <div class="stat-card">
+    <div class="label">Shop revenue (30 days)</div>
+    <div class="value" style="font-size:22px">{{ shop_revenue_30d|default:0 }}</div>
+  </div>
+  <div class="stat-card">
+    <div class="label">Low stock</div>
+    <div class="value">{{ low_stock_products|default:0 }}</div>
+  </div>
+  {% endif %}
+  {% if 'events' in enabled_features %}
+  <div class="stat-card">
+    <div class="label">Upcoming events</div>
+    <div class="value">{{ upcoming_events|default:0 }}</div>
+  </div>
+  {% endif %}
+  {% if 'shipping' in enabled_features %}
+  <div class="stat-card">
+    <div class="label">Unshipped orders</div>
+    <div class="value">{{ unshipped_orders|default:0 }}</div>
+  </div>
+  {% endif %}
 </div>
 
 <div class="split">