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>

README.md

@@ -76,6 +76,18 @@ social-graph/
 └── docker-compose.yml
 ```
 
+## Production (Docker + прокси на хосте)
+
+См. [deploy/README.md](deploy/README.md).
+
+Кратко:
+
+```bash
+cp deploy/.env.prod.example deploy/.env.prod
+docker compose -f docker-compose.prod.yml --env-file deploy/.env.prod up -d frontend
+# прокси на хосте → http://127.0.0.1:8080 (см. deploy/apache/social-graph.conf)
+```
+
 ## Запуск без Docker
 
 **Backend:**