Add local-first SPA architecture and containerized production deploy.

Move data access to use-cases and IndexedDB repositories with optional
remote fallback, changelog/sync ports, and encrypted local backup.
Add production Docker Compose (nginx frontend + optional backend) and
Apache host proxy configuration for deployment.

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy/.env.prod.example

@@ -0,0 +1,12 @@
+# Режим данных при сборке фронта: local | remote | hybrid
+VITE_DATA_MODE=local
+
+# Порты на хосте (для прокси-сервера)
+FRONTEND_BIND=127.0.0.1
+FRONTEND_PORT=8080
+BACKEND_BIND=127.0.0.1
+BACKEND_PORT=8000
+
+# Только при profile with-backend (VITE_DATA_MODE=remote)
+DJANGO_SECRET_KEY=replace-with-long-random-string
+ALLOWED_HOSTS=your-domain.com,www.your-domain.com