Fix Dockerfile for HF Spaces - use requirements.txt, port 7860, uvicorn

Dockerfile

@@ -2,16 +2,14 @@ FROM python:3.11-slim
 
 WORKDIR /app
 
-COPY pyproject.toml ./
-COPY requirements.txt* ./
+COPY requirements.txt ./
 
-RUN pip install --no-cache-dir uv && \
-    uv pip install --system --no-cache -r pyproject.toml
+RUN pip install --no-cache-dir -r requirements.txt
 
 COPY . .
 
-EXPOSE 8000
+EXPOSE 7860
 
 ENV PYTHONUNBUFFERED=1
 
-CMD ["python", "app.py"]
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]