feat: backend ingest API, Docker Compose, Ubuntu install guide

- FastAPI: POST /api/v1/events, GET /health, JSON Schema validation

- PostgreSQL models, Alembic migration, bootstrap API key

- deploy/docker-compose.yml, .env.example

- docs/install-ubuntu-24.04.md, updated work-plan (agents first)

docs/INDEX.md

@@ -9,6 +9,7 @@
 | [event-schema-v1.json](event-schema-v1.json) | JSON Schema событий |
 | [work-plan.md](work-plan.md) | План работ по фазам |
 | [roadmap.md](roadmap.md) | Дорожная карта версий |
+| [install-ubuntu-24.04.md](install-ubuntu-24.04.md) | **Подготовка сервера:** Docker, git, firewall, первый запуск |
 | [deployment.md](deployment.md) | Ubuntu 24.04, backup, TLS |
 | [workspace-three-repos.md](workspace-three-repos.md) | Cursor multi-root |