Address Copilot code review feedback

Fixes applied:
- Fix NEO4J_PLUGINS JSON syntax in docker-compose.yml
- Fix directory name mismatch in README.md
- Remove unused imports (Any, Optional), add re and os
- Use Tuple from typing instead of lowercase tuple
- Move 're' import to module level (PEP 8)
- Configure Ollama client with OLLAMA_HOST env var for Docker
- Fix Cypher injection: use parameterized query for hops
- Make CONTAINS queries case-insensitive with toLower()
- Add try-finally block to ensure graph.close() on exceptions

rag_tutorials/knowledge_graph_rag_citations/README.md

@@ -47,7 +47,7 @@ Traditional vector-based RAG finds similar text chunks, but struggles with:
 
 ```bash
 # Clone and navigate
-cd knowledge_graph_rag_with_citations
+cd knowledge_graph_rag_citations
 
 # Install dependencies
 pip install -r requirements.txt