fix: implement robust in-memory PDF parsing and client-side error handling

feat: add Gemini OCR fallback for scanned resume PDFs

fix: remove remaining sentence-transformers import from ats_score

feat: complete next.js frontend and fastapi backend

Added semantic scoring, experience, education and format checker

Final clean version - AI Recruitment Copilot

Complete AI Recruitment Copilot - fully working

Added Streamlit frontend