完善文档与前端迁移，补充开源协议

backend/Dockerfile

@@ -1,24 +1,35 @@
+FROM python:3.11-slim AS builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    libmagic1 \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN python -m venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
 FROM python:3.11-slim
 
 WORKDIR /app
 
-# Install system dependencies (gcc for compiling Python packages)
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    gcc \
+    libmagic1 \
     && rm -rf /var/lib/apt/lists/*
 
-# Copy requirements and install Python dependencies
-COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
+ENV PATH="/opt/venv/bin:$PATH"
+ENV PYTHONUNBUFFERED=1
 
-# Copy application code
+COPY --from=builder /opt/venv /opt/venv
 COPY . .
 
-# Create uploads directory
 RUN mkdir -p uploads
 
-# Expose port
 EXPOSE 8000
 
-# Run database migrations and start server
 CMD alembic upgrade head && uvicorn main:app --host 0.0.0.0 --port 8000