Rename the data directory from palladium-node-data/ to .palladium/
to align with Unix convention for application data directories.
This change makes the directory hidden by default and follows the
standard naming pattern used by blockchain nodes
Add Docker ignore file to exclude unnecessary files from build context:
- Git files and documentation
- Docker configuration files
- Runtime data and logs
- Python cache and test files
- IDE/editor files
- Environment and temporary files
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Co-Authored-By: Claude <noreply@anthropic.com>