Add root Dockerfile for Hugging Face Docker Space

Dockerfile

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+FROM python:3.11-slim
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libmagic1 \
+    libmagic-dev \
+    libjpeg-dev \
+    zlib1g-dev \
+    libwebp-dev \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY backend/requirements.txt ./requirements.txt
+RUN pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir -r requirements.txt
+
+COPY backend/ .
+
+RUN useradd -m -u 1000 appuser && chown -R appuser:appuser /app
+USER appuser
+
+EXPOSE 7860
+
+HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
+    CMD curl -f http://localhost:7860/health || exit 1
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860", "--workers", "2"]