refactor: remove python3 symlink redirection and add default N8N_LOG_LEVEL configuration

chore: rename python3 to python3-sync to avoid conflicts in container execution environment

chore: reduce build output verbosity by adding quiet flags to package installers

feat: install python3-venv and automatically initialize a local virtual environment for n8n in start script

refactor: optimize startup, improve security, and simplify n8n configuration for v2 compatibility

feat: add open-source files, fix critical bugs, rewrite README with Duplicate Space button

initial commit