feat: Implement comprehensive backup web application with Docker, systemd service, and Gunicorn support

Dockerfile

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+# Dockerfile for Backup Web Application
+FROM python:3.11-slim
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements and install Python dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application files
+COPY backup-web-app.py .
+COPY templates/ ./templates/
+COPY static/ ./static/
+
+# Create non-root user
+RUN useradd -m -u 1000 appuser && chown -R appuser:appuser /app
+USER appuser
+
+# Expose port
+EXPOSE 5000
+
+# Environment variables
+ENV FLASK_ENV=production
+ENV BACKUP_ROOT=/data/backups
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD curl -f http://localhost:5000/health || exit 1
+
+# Run application
+CMD ["python", "backup-web-app.py"]