fix: add proxy headers support for HF Spaces

Dockerfile

@@ -61,5 +61,5 @@ EXPOSE 7860
 HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
     CMD python -c "import requests; requests.get('http://localhost:7860/', timeout=5)"
 
-# Run FastAPI directly on port 7860 (HF Spaces standard)
-CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860"]
+# Run FastAPI directly on port 7860 with proxy headers support
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860", "--proxy-headers", "--forwarded-allow-ips", "*"]