fix: Force Streamlit to use port 7860 for HuggingFace Spaces

- Add .streamlit/config.toml to override default port 8501
- Set port = 7860 explicitly for HF Spaces compatibility
- Add headless = true and disable usage stats for container deployment
- This ensures VoiceCal is accessible on the correct HF Spaces port

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.streamlit/config.toml

@@ -0,0 +1,9 @@
+[server]
+port = 7860
+address = "0.0.0.0"
+headless = true
+enableCORS = false
+enableXsrfProtection = false
+
+[browser]
+gatherUsageStats = false

Dockerfile

@@ -34,5 +34,5 @@ EXPOSE 7860
 ENV GRADIO_SERVER_NAME="0.0.0.0" \
     GRADIO_SERVER_PORT=7860
 
-# Run simplified Streamlit app with direct STT connection
-CMD ["streamlit", "run", "streamlit_websocket_app.py", "--server.port", "7860", "--server.address", "0.0.0.0"]
+# Run simplified Streamlit app with direct STT connection on HF port 7860
+CMD ["streamlit", "run", "streamlit_websocket_app.py", "--server.port", "7860", "--server.address", "0.0.0.0", "--server.headless", "true"]