Fixed categorical colors.

Many updates, mainly added categorical.

Implement DOI list handling in CSV uploads and add highlight color feature in predictions. Refactor embedding creation function for clarity and enhance OpenAlex record fetching with new utility function.

Refactor app.py to improve handling of serialized data in DataFrame uploads, replacing previous parsing logic with a more robust JSON and Python-repr parsing function. Update file upload instructions to clarify supported formats.

Kicked out pkl upload, fixed csv-upload. Update requirements.txt to specify torch version and add gradio dependency.

Enhance data processing in app.py and openalex_utils.py by improving handling of referenced works and filling missing publication values with spaces.

Enhance data processing by adding CSV and Pickle file upload support, improving error handling, and refining the prediction pipeline. Update the `process_records_to_df` function to handle existing DataFrames and ensure required fields are processed correctly.

drop duplicates

Temorary change from medioid to mean

first commit