chore: scaffold initial project with env config, docker setup, and quickstart docs

Dockerfile

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+# Multi-stage Dockerfile for WebDAV Server
+# Optimized for production deployment
+
+# ============================================================================
+# Stage 1: Builder - Install dependencies and prepare environment
+# ============================================================================
+FROM python:3.11-slim as builder
+
+# Set working directory
+WORKDIR /build
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    g++ \
+    libxml2-dev \
+    libxslt-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements
+COPY requirements.txt .
+
+# Install Python dependencies to a target directory
+RUN pip install --no-cache-dir --prefix=/install -r requirements.txt
+
+
+# ============================================================================
+# Stage 2: Runtime - Create minimal production image
+# ============================================================================
+FROM python:3.11-slim
+
+# Set labels for metadata
+LABEL maintainer="WebDAV Server <webdav@example.com>"
+LABEL description="Production-ready WebDAV Server with aiohttp"
+LABEL version="1.0.0"
+
+# Create app user for security (don't run as root)
+RUN groupadd -r webdav && useradd -r -g webdav webdav
+
+# Install runtime dependencies only
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libxml2 \
+    libxslt1.1 \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set working directory
+WORKDIR /app
+
+# Copy Python packages from builder
+COPY --from=builder /install /usr/local
+
+# Copy application files
+COPY main.py .
+COPY config.py .
+COPY .env.example .env
+
+# Create necessary directories
+RUN mkdir -p /app/webdav /app/logs /app/backups && \
+    chown -R webdav:webdav /app
+
+# Switch to non-root user
+USER webdav
+
+# Expose port
+EXPOSE 8080
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD curl -f http://localhost:8080/ || exit 1
+
+# Set environment variables
+ENV PYTHONUNBUFFERED=1
+ENV HOST=0.0.0.0
+ENV PORT=8080
+
+# Run application
+CMD ["python", "main.py"]