fix build

Author: shinonomeow

Dockerfile

@@ -24,7 +24,7 @@ ENV PATH="/root/.local/bin:$PATH"
 WORKDIR /build
 
 # 复制依赖文件并安装（这层会被缓存，除非依赖文件改变）
-COPY backend/pyproject.toml backend/uv.lock requirements.txt ./
+COPY backend/pyproject.toml backend/uv.lock backend/requirements.txt ./
 
 # 安装Python依赖
 RUN uv sync --frozen --no-dev