feat: add confluence/slack search tools, chat history, cloud Qdrant support, sync trigger fixes

fix: enhance admin functionality and error handling in ingestion and analytics processes

feat: channel RBAC through ingest, graph stream, admin endpoints, email invite

feat: add Zustand stores for filters and UI state management

Fix WebSocket stream: use result.data() instead of async for to match working traverse pattern

Use fresh Neo4j driver per request; create driver after Gemini extraction to avoid idle timeout

Add retry-on-SessionExpired for ingest writes; fix WebSocket driver init error handling

Fix chunk relationship injection and WebSocket close handling

Fix defunct Neo4j connection: add keep-alive, liveness check, retry on SessionExpired

Add Neo4j graph stream WebSocket endpoint for live visualization

Fix startup imports and add graph_store module