Refactor FastAPI application structure and update test imports for backward compatibility

Refactor FastAPI application for improved modularity and maintainability

Enhance PDF chunking logic and add validation for chat requests to improve data integrity and user experience

Refactor session management and enhance PDF upload handling for improved error handling and model consistency

Enhance session management in load_session function to ensure LLM consistency and improve error handling. Update chunk processing to accommodate larger text sizes and integrate conversation memory for chat history management.

Refactor PDF processing and embedding creation; update chunking to include metadata

Redirect home route to static index.html

Implement PDF removal functionality and update UI with remove button

Refactor app.py to implement FastAPI for PDF processing, session management, and chat functionality

Update .gitignore and adjust Max Tokens slider range in app.py

Add chat history download options (HTML. JSON)

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