feat: replace manual web scraping with an agentic tool-selection engine

refactor: replace daily usage increment with atomic reservation

feat: implement WebSocket-based streaming chat

refactor: replace standard logging with a centralized loguru configuration and interception handler

feat: implement Redis-first refresh token storage with Supabase fallback

feat: integrate Alembic for automated database schema migrations and define ORM models

refactor: remove ProxyHeadersMiddleware and reorder CORS middleware configuration to ensure proper request processing

refactor: secure CORS origins and centralize user profile session exchange during authentication flow

feat: enable ProxyHeadersMiddleware for Hugging Face deployment and add production simulation tests

refactor: expand JWT algorithm support

refactor: implement stateless Supabase JWT validation to resolve 403 race conditions

feat: implement LLM fallback for quiz generation and enhance OAuth error handling

feat: implement in-memory email rate limiting and adjust RAG search parameters

feat: implement password update functionality and add signup, forgot-password, and update-password pages

feat: implement profile avatar upload functionality to Supabase storage

feat: implement ASR pipeline with async batch processing, FastAPI endpoints, and client-side transcription support

refactor: update system prompts safety guidelines

refactor: add NSFW and gibbreish words filtering

refactor: remove unnecessary sign up page

refactor: replace legacy login page with integrated Google OAuth landing page and dashboard redirect logic

feat: implement daily request rate limiting with per-user usage tracking and admin bypass

feat: implement search functionality, add background task queue logic for title conflicts, and enhance auth state synchronization

feat: Adding Parallel Processing and enhance main dashboard, summary and chat styles

feat: implement authentication system, add quiz history support, and update API endpoints for material and tutor interactions

feat: migrate UI to Next.js with extensive component library and integrate Hugging Face deployment workflow

refactor: restructure project into modular src architecture and implement database store layer