chore: Update Hugging Face model and add text anonymization endpoint

Update spaCy model to en_core_web_lg

chore: Add CORS middleware to FastAPI app

Update requirements.txt to include python-docx, presidio-analyzer==2.*, presidio-anonymizer==2.*, transformers, and python-dotenv

chore: Update requirements.txt

chore: Add Dockerfile and requirements.txt for containerization