Add Django site, Docker packaging, and beta/prod Gitea deploys.

Unignore site/ (was blocked by mkdocs /site rule), add compose/Docker/uv tooling, and split deploys so push to main goes to beta while prod stays manual.

site/core/models.py

@@ -0,0 +1,20 @@
+import uuid
+
+from django.db import models
+
+
+class TimeStampedModel(models.Model):
+    """Abstract base with created/updated timestamps (mirrors company_site TimeInfoBase)."""
+
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        abstract = True
+
+
+class UUIDPrimaryKeyModel(models.Model):
+    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+
+    class Meta:
+        abstract = True