- Moved core/ directory to aitbc_cli/core/ to make it a proper subpackage
- Updated aitbc_cli.py to load from new path
- Simplified aitbc_cli/__init__.py to use normal import instead of spec_from_file_location
- Updated all core imports to use aitbc_cli.core prefix
- Copied utils files (wallet_daemon_client, error_handling, crypto_utils, subprocess) to aitbc_cli/utils/
- Fixed wallet list command to work with new structure
- This fixes ModuleNotFoundError for aitbc_cli.core submodules
