Self-signed SSL certificates are now generated at first startup instead
of being baked into the Docker image. Certificates persist in ./certs/
and are reused on subsequent runs. Users can provide their own certs
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 standard .gitignore entries to exclude development environment files,
OS-generated files, temporary files, and other common patterns from version control
