Update docker/Dockerfile

docker/Dockerfile

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+FROM python:3.11-slim
+
+# System deps for matplotlib + fonts for PDF clarity
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    fonts-dejavu \
+    libfreetype6 \
+    libpng16-16 \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY requirements.txt /app/requirements.txt
+RUN pip install --no-cache-dir -r /app/requirements.txt
+
+COPY . /app
+
+# Hugging Face Spaces expects port 7860
+EXPOSE 7860
+
+ENV PYTHONUNBUFFERED=1
+ENV GRADIO_SERVER_NAME=0.0.0.0
+ENV GRADIO_SERVER_PORT=7860
+
+CMD ["python", "main.py"]