Sub-phase 1.5.3: Full RAG Database page with document listing, expandable chunk viewer, delete with confirmation, and document upload. Adds TypeScript types, API functions, TanStack Query hooks (useQuery + useMutation with cache invalidation), and three new components (DocumentList, ChunkList, DocumentUpload).
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
c10318b7f7