refactor: consolidate imports and remove duplicates

[naveen-malla]

• Move all imports to the top of the file, organized by standard library and third-party
• Remove duplicate import statements scattered throughout the file
• Remove redundant local 're' import in _safe_filename function
• Add descriptive section headers for better code organization

[naveen-malla]

hey, are you accepting pull requests or has the development for this project ended?