Refactor QA model loading and response generation in app.py

Update requirements.txt to allow flexible versions for transformers and sentence-transformers

Update torch version in requirements.txt and reorder package specifications

Update requirements.txt to fix package versions and adjust runtime.txt for Python version

Update torch version in requirements.txt and remove version constraint for gradio

Update gradio version constraint to allow for newer releases

Update requirements.txt with specific package versions and add runtime.txt for Python version

Remove version constraint for transformers in requirements.txt

Remove unused dotenv import and simplify QA model initialization

Add main application logic and requirements file for PDF processing and QA model

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