Fix: Use uvicorn instead of gunicorn for ASGI

Dockerfile

@@ -10,4 +10,4 @@ ENV MODEL_ARTIFACT_DIR=/data/artifacts/models
 ENV DATASET_DIR=/data/learning_outcome_os_dataset_v2
 ENV LOG_LEVEL=INFO
 EXPOSE 7860
-CMD ["gunicorn", "-w", "4", "-b", "0.0.0.0:7860", "--timeout", "120", "app.main:app"]
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860"]

requirements.txt

@@ -5,7 +5,6 @@
 # --- Web Framework ---
 fastapi==0.115.6
 uvicorn==0.34.0
-gunicorn==23.0.0
 pydantic==2.10.4
 pydantic-settings==2.7.1