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/events/admin.py

@@ -0,0 +1,24 @@
+from django.contrib import admin
+
+from events.models import Event, Ticket, TicketOrder
+
+
+@admin.register(Event)
+class EventAdmin(admin.ModelAdmin):
+    list_display = ("title", "starts_at", "capacity", "price", "is_published")
+    list_filter = ("is_published",)
+    search_fields = ("title", "venue")
+    prepopulated_fields = {"slug": ("title",)}
+
+
+@admin.register(TicketOrder)
+class TicketOrderAdmin(admin.ModelAdmin):
+    list_display = ("number", "event", "email", "quantity", "status")
+    list_filter = ("status",)
+    search_fields = ("number", "email")
+
+
+@admin.register(Ticket)
+class TicketAdmin(admin.ModelAdmin):
+    list_display = ("code", "event", "order")
+    search_fields = ("code",)