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.

docker-compose.prod.yml

@@ -0,0 +1,22 @@
+# Production compose for server-infra deploy. No bundled Postgres — use shared
+# external DB via DATABASE_URL in .env (see .env.prod.example).
+#
+# Web runs on every app host (active/active). Start the dj-queue worker on
+# exactly ONE host via:
+#   docker compose -f docker-compose.prod.yml --profile worker up -d
+services:
+  web:
+    build: .
+    restart: unless-stopped
+    ports:
+      - "${WEB_PORT:-8004}:8000"
+    env_file:
+      - .env
+
+  worker:
+    build: .
+    restart: unless-stopped
+    profiles: ["worker"]
+    entrypoint: ["/worker-entrypoint.sh"]
+    env_file:
+      - .env