chore: add HF Spaces YAML frontmatter

chore: update .gitignore and README for improved clarity and functionality

- Introduced a new API endpoint for finding similar content in the tenant's workspace, allowing users to identify overlapping uploads and draft notes.

feat: FAISS-only vector store (remove Chroma)

feat: enhance document upload and processing capabilities with new personalisation features

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