feat(integration): resolve quiz proxy auth forwarding and groq model configuration

[abdth3]

Summary of Changes

• Quiz Proxy Authorization Header: Fixed 403 Forbidden (Not authenticated) responses by injecting and forwarding an internal JWT Authorization: Bearer <token> header from Pluto backend (web/backend/routes/quiz.py) to the AI-ML Quiz Generator service (8002).
• Groq Model Realignment: Aligned LLM model definitions in ai-ml/quiz_generator/app/config.py to prevent upstream 404 Model Not Found errors during quiz generation.
• Cross-Service Communication: Verified multi-service connectivity across Web Backend (5000), Frontend (5173), Chatbot RAG Engine (8000), Ingestion (8001), and Quiz Generator (8002).

Testing & Verification

• Validated end-to-end quiz generation pipeline from UI prompt to server-side session persistence in MongoDB and sanitized question delivery to the frontend.
• Confirmed document ingestion and vector querying lifecycle.