feat: natural language query + production hardening
Features: - Add /api/ask endpoint for plain-language audit log queries - Regex-based time/entity extraction (no LLM required for parsing) - LLM-powered narrative summarisation with OpenAI-compatible APIs - Graceful fallback to structured bullet lists when LLM is unavailable - Frontend ask panel with markdown rendering and cited events Production: - Harden Dockerfile: non-root user, gunicorn+uvicorn workers - Add docker-compose.prod.yml with internal networks and health checks - Add nginx reverse proxy with security headers - MongoDB no longer exposed externally in production Tests: - 29 new tests for ask parsing, query building, and endpoint behaviour - Fix conftest monkeypatch for routes.ask events collection Bump version to 1.1.0
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