docs: emphasize Hugging Face Spaces deployment

docs: add Real-Time Literature Search with ArXiv integration to features

docs: update LinkedIn profile URL

docs: update license and ownership to Soumana Dama

docs: replace OPENAI_API_KEY with K2_THINK_API_KEY in README

docs: update README with detailed project features for LinkedIn

fix: restore missing imports in security.py

fix: bcrypt 4.0 compatibility patch and support for passwords > 72 bytes

fix: add missing logger import in users.py

fix: add missing dependencies itsdangerous and starlette for session middleware

fix: database connection string normalization and improved error logging for cloud deployment

Fix: Add missing ENVIRONMENT and DEBUG settings to prevent AttributeError on 500 errors

Fix: Add SessionMiddleware for Google OAuth and ensure routing synchronization

fix: correct router imports and update docker-compose for decoupled frontend

feat: integrate Google OAuth, ArXiv discovery and project-based analysis

Handle missing OpenAI key for embeddings

Initial clean backend deployment