hoangStud13/Unternehmenssoftware-WS25-26

AI Summary: The request is to refactor the project by recursively iterating through all files and directories to replace hardcoded path references with a new, uniform `data_dir` base component. Additionally, all CSV and Parquet files must be reorganized into a centralized `data` directory following a specified hierarchical structure. The goal is to achieve a consistent path topology that aligns with the project's processing steps and modular data pipeline.