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/shipping/models.py

@@ -0,0 +1,33 @@
+from django.db import models
+
+from core.models import TimeStampedModel, UUIDPrimaryKeyModel
+from shop.models import Order
+
+
+class Shipment(UUIDPrimaryKeyModel, TimeStampedModel):
+    class Status(models.TextChoices):
+        DRAFT = "draft", "Draft"
+        RATED = "rated", "Rated"
+        LABELED = "labeled", "Labeled"
+        VOID = "void", "Void"
+
+    order = models.ForeignKey(Order, on_delete=models.PROTECT, related_name="shipments")
+    status = models.CharField(
+        max_length=16, choices=Status.choices, default=Status.DRAFT
+    )
+    carrier = models.CharField(max_length=32, blank=True)
+    service = models.CharField(max_length=64, blank=True)
+    tracking_number = models.CharField(max_length=64, blank=True)
+    label_url = models.URLField(blank=True)
+    rate_amount = models.DecimalField(max_digits=10, decimal_places=2, null=True, blank=True)
+    currency = models.CharField(max_length=8, default="usd")
+    provider_shipment_id = models.CharField(max_length=255, blank=True)
+    rates = models.JSONField(default=list, blank=True)
+    weight_oz = models.PositiveIntegerField(default=16)
+    notes = models.TextField(blank=True)
+
+    class Meta:
+        ordering = ["-created_at"]
+
+    def __str__(self) -> str:
+        return f"{self.order.number} · {self.tracking_number or self.status}"