Fix Dockerfile for HF Space root layout

Dockerfile

@@ -5,12 +5,11 @@ WORKDIR /app
 ENV PYTHONDONTWRITEBYTECODE=1
 ENV PYTHONUNBUFFERED=1
 
-COPY backend/requirements.txt /app/requirements.txt
+COPY requirements.txt /app/requirements.txt
 RUN pip install --no-cache-dir -r /app/requirements.txt
 
-COPY backend /app/backend
-COPY data_sources /app/data_sources
+COPY . /app
 
-EXPOSE 8000
+EXPOSE 7860
 
-CMD ["uvicorn", "api.app:app", "--host", "0.0.0.0", "--port", "8000"]
+CMD ["uvicorn", "api.app:app", "--host", "0.0.0.0", "--port", "7860"]