fix: 添加 README.md 到 Docker 构建

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Dockerfile

@@ -13,7 +13,7 @@ RUN apt-get update && apt-get install -y \
     && rm -rf /var/lib/apt/lists/*
 
 # 复制项目文件
-COPY pyproject.toml .
+COPY pyproject.toml README.md ./
 COPY src/ src/
 
 # 安装 Python 依赖