updated first commit

Dockerfile

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+FROM python:3.11-slim
+
+LABEL maintainer="SKE Digital Signage"
+LABEL version="2.0.0"
+LABEL description="SKE Digital Signage Server"
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    libreoffice \
+    poppler-utils \
+    ffmpeg \
+    libpoppler-cpp-dev \
+    libmagic1 \
+    libffi-dev \
+    libssl-dev \
+    g++ \
+    curl \
+    libjpeg-dev \
+    zlib1g-dev \
+    libxml2-dev \
+    libxslt-dev \
+    build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create non-root user for security
+RUN useradd -r -s /bin/bash -m -d /app -u 1001 appuser
+
+# Copy requirements first to leverage Docker cache
+COPY requirements.txt .
+
+# Upgrade pip and install Python dependencies
+RUN python -m pip install --upgrade pip && \
+    pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY . .
+
+# Create necessary directories
+RUN mkdir -p instance static/uploads static/assets logs
+
+# Set ownership to non-root user
+RUN chown -R appuser:appuser /app
+
+# Switch to non-root user
+USER appuser
+
+# Expose port
+EXPOSE 5000
+
+# Environment variables
+ENV FLASK_APP=main.py
+ENV FLASK_ENV=production
+ENV PYTHONPATH=/app
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD curl -f http://localhost:5000/api/health || exit 1
+
+# Run the application
+CMD ["python", "main.py"]