fix: organize project structure into backend/frontend/nginx folders

backend/Dockerfile

@@ -0,0 +1,23 @@
+FROM python:3.12-slim
+
+WORKDIR /app
+
+# Install system deps
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl gcc libffi-dev && \
+    rm -rf /var/lib/apt/lists/*
+
+# Install Python deps
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy app
+COPY app.py .
+COPY cis_runner.py .
+
+# Data volume
+RUN mkdir -p /data
+
+EXPOSE 8000
+
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "2"]