Fix Streamlit CORS issues and missing openai dependency for Gemini proxy

ml-service/requirements.txt

@@ -20,6 +20,7 @@ websockets>=12.0
 
 # --- LLM Detoxification (Gemini API) ---
 google-genai>=1.0.0
+openai>=1.0.0
 
 # --- Async Utilities ---
 anyio>=4.0.0

start.sh

@@ -24,4 +24,4 @@ cd ../python-frontend
 export SAFECHAT_API_URL="http://127.0.0.1:8000"
 
 # HF Spaces requires the app to bind to 0.0.0.0 and port 7860
-streamlit run app.py --server.port=7860 --server.address=0.0.0.0
+streamlit run app.py --server.port=7860 --server.address=0.0.0.0 --server.enableCORS=false --server.enableXsrfProtection=false