Enable OAuth authentication with Hugging Face

Added `hf_oauth: true` to README metadata to enable "Sign in with Hugging Face" OAuth authentication.

This allows:
- User authentication and profile access
- Per-user session state isolation
- Secure multi-tenant data management
- User-specific persistent storage

Next step: Update app.py to implement LoginButton and per-user data handling using gr.OAuthProfile and gr.State for session management.

README.md

@@ -6,6 +6,7 @@ colorTo: purple
 sdk: gradio
 pinned: false
 short_description: A simple Gradio app
+hf_oauth: true
 ---
 # StrategyStack Recovery, Enrichment & Outreach Platform