This commit implements a clean architecture where environment variables
are only read, never set, ensuring compatibility with other ComfyUI
packages.
The changes: - Remove all code that sets global environment variables -
Clean up config.yaml to remove API key placeholders - Add documentation
for safe environment handling - Add comprehensive tests to verify
non-polluting behavior - Ensure backward compatibility for other
packages
The commit includes detailed docs explaining the clean architecture and
safety guarantees for package compatibility.