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)

.gitignore

@@ -6,6 +6,7 @@ venv/
 .env
 .env.*
 !.env.example
+deploy/.env
 
 # Node / frontend (будущее)
 node_modules/