- Change default database path from sessions.db to /tmp/sessions.db (writable in containers)
- Update EfficientContextManager to accept db_path parameter and use settings
- Update all config files (config.py, src/config.py) to use /tmp for database paths
- Update FAISS index path to /tmp/embeddings.faiss
- Update ZeroGPUUserManager default db_path to /tmp/sessions.db
- Fix libgomp OMP_NUM_THREADS warning by setting ENV variables in Dockerfile
- Prevents sqlite3.OperationalError: unable to open database file
