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/messaging/admin.py

@@ -0,0 +1,40 @@
+from django.contrib import admin
+
+from messaging.models import Campaign, Message, MessageTemplate, ProviderEvent
+
+
+@admin.register(MessageTemplate)
+class MessageTemplateAdmin(admin.ModelAdmin):
+    list_display = ("name", "channel", "created_at")
+    list_filter = ("channel",)
+
+
+class MessageInline(admin.TabularInline):
+    model = Message
+    extra = 0
+    readonly_fields = ("status", "provider", "provider_message_id", "sent_at")
+
+
+@admin.register(Campaign)
+class CampaignAdmin(admin.ModelAdmin):
+    list_display = (
+        "name",
+        "channel",
+        "audience",
+        "status",
+        "scheduled_for",
+        "created_at",
+    )
+    list_filter = ("channel", "audience", "status")
+    inlines = [MessageInline]
+
+
+@admin.register(Message)
+class MessageAdmin(admin.ModelAdmin):
+    list_display = ("campaign", "contact", "channel", "status", "scheduled_for")
+    list_filter = ("channel", "status")
+
+
+@admin.register(ProviderEvent)
+class ProviderEventAdmin(admin.ModelAdmin):
+    list_display = ("provider", "event_type", "created_at")