fix: improve Docker setup and optimize relationship traversal

[edraobdu]

Summary

• Fixes Docker volume permission issues with dedicated entrypoint script
• Optimizes database relationship traversal using batch queries instead of individual lookups
• Improves CLI user experience with progress indicators

Changes

• Docker: Added entrypoint script to handle permissions, updated Dockerfile
• Performance: Batch query optimization in graph traversal (significant speedup)
• UX: Added spinner utility for long-running operations
• Docs: Enhanced Docker usage documentation with troubleshooting

Test Plan

• Docker container runs without permission errors
• Traversal performance improved on large relationship graphs
• Progress indicators display correctly during operations