Refactors dataset management to consistently append '-vl' for vision-language
datasets and dynamically name cleaned datasets (e.g., 'dataset-cleaned').
Enforces vLLM as a strict dependency for LLM-based data cleaning, exiting if
unavailable. Integrates 'enable_thinking' option for LLM cleaning and enables
cleaning by default in relevant test configurations.
Adds torchvision dependency for vision models and streamlines the cleaning call
in training to centralize decision-making.
xming521