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/management/commands/dispatch_due.py

@@ -0,0 +1,38 @@
+from django.core.management.base import BaseCommand
+from django.utils import timezone
+
+from messaging.models import Message
+from messaging.tasks import send_campaign_message
+from social.models import SocialPost
+from social.tasks import publish_social_post
+
+
+class Command(BaseCommand):
+    help = (
+        "Enqueue due scheduled campaign messages and social posts. "
+        "Optional when the task backend supports run_after defer; useful as a safety net."
+    )
+
+    def handle(self, *args, **options):
+        now = timezone.now()
+        enqueued = 0
+
+        for message in Message.objects.filter(
+            status=Message.Status.SCHEDULED,
+            scheduled_for__lte=now,
+        ).iterator():
+            message.status = Message.Status.QUEUED
+            message.save(update_fields=["status", "updated_at"])
+            send_campaign_message.enqueue(message_id=str(message.pk))
+            enqueued += 1
+
+        for post in SocialPost.objects.filter(
+            status=SocialPost.Status.SCHEDULED,
+            scheduled_for__lte=now,
+        ).iterator():
+            post.status = SocialPost.Status.QUEUED
+            post.save(update_fields=["status", "updated_at"])
+            publish_social_post.enqueue(post_id=str(post.pk))
+            enqueued += 1
+
+        self.stdout.write(self.style.SUCCESS(f"Enqueued {enqueued} due item(s)."))