Add demo documentation and Docker setup for v2 report generation system

Ship production RAG hardening: citation extraction, full-library retrieval, auth.

Speed up generation and ingestion; add live report progress on /status.

feat: async pipeline, job queue, generation hardening, and docs

- Added support for RICS survey levels (1, 2, 3) in document uploads and reports, allowing for better tier management and retrieval filtering.

- Replaced timezone.utc with UTC from datetime for consistent datetime handling.

- Updated `.env.example` to include new settings for bulk upload limits and batch processing.

feat: scaffold complete RAG system for RICS-style report generation