Update Dockerfile to handle HuggingFace token secret and adjust port

- Add Docker secret mounting for HuggingFace token
- Verify secret file existence with a simple check
- Revert server port back to 8000

Dockerfile

@@ -9,4 +9,7 @@ COPY . .
 
 EXPOSE 8000
 
-CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]
+RUN --mount=type=secret,id=HUGGINGFACE_TOKEN,mode=0444,required=true \
+    test -f /run/secrets/HUGGINGFACE_TOKEN && echo "Secret exists!"
+
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "8000"]