Fix: Add backend OAuth config API for client_id

Major Fix: Replace @huggingface/hub with direct OAuth redirect

Fix: OAuth clientId missing error in HF Spaces

Debug: Enhanced HF Spaces environment detection

Fix: Auto-trigger auth modal in HF Spaces

Implement client-side OAuth authentication with popup modal

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Fix HF Spaces iframe session persistence with localStorage fallback

Implement HF Spaces best practice: new tab login flow

Fix usage tracker to read user from session

Add debug logging to auth status endpoint

Simplify authentication flow to fix login issues

Fix login modal authentication issues

Implement popup login modal system

Add research paper PDF to login page with Git LFS

Simplify login page and remove API key option

🔧 Fix TypeScript build error in API headers

🔑 Add dual authentication system: API key + OAuth

Switch login page to light theme for consistency with main app

Simplify login page: remove badges and institutional info

Separate login page to HTML template for better maintainability

Use shadcn/ui design system for login page consistency

✨ Simplify landing page: Bigger CTA & cleaner design

🎨 Complete redesign: Premium research platform landing page

Redesign login page with cleaner, minimal design

Remove target='_blank' for single-page login experience

Fix iframe cookie issues for HF Spaces

Fix OAuth according to HF official documentation

Fix UnboundLocalError and add environment detection debug

Add comprehensive session debugging

Add HF Spaces specific session configuration

Add detailed session debugging

Add smart authentication redirect system

Fix dependencies import conflict

Implement dependency injection authentication system

TEMP: Disable auth middleware to debug session issues

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Fix HF user info parsing and OAuth scope issues

Fix session persistence and add detailed debugging

Fix OAuth state verification and permissions policy issues

Fix OAuth redirect URI for HF Spaces

Fix middleware order and session access issues

Enhance authentication requirements for root and agentgraph endpoints

Enhance authentication middleware by adding HTTPException import

Fix missing Request import in observability router

Implement mandatory authentication and usage tracking for OpenAI API protection

Fix HF Spaces authentication: support __sign parameter and make auth optional

Add 'itsdangerous' dependency for session management and enhance OAuth configuration with scope validation and warnings for unsupported scopes in Hugging Face Spaces.

Update session management in FastAPI app, modify OAuth scopes in environment configuration, and enhance .env.example with session security details.