- Add SQLCipher encryption for ait-mainnet database with configurable flag
- Add db_encryption_enabled and db_encryption_key_path config settings
- Implement encryption key loading and PRAGMA key setup via connection events
- Add shutdown_db function for proper database cleanup
- Export middleware classes in aitbc/__init__.py
- Fix import path in sync.py for settings
- Remove duplicate agent documentation from docs
The wrapper scripts were setting PYTHONPATH to only the app's src directory,
causing 'ModuleNotFoundError: No module named aitbc' when services tried
to import from the aitbc package. Added REPO_DIR to PYTHONPATH in
coordinator-api, agent-coordinator, and explorer wrappers to allow aitbc imports.