update prod env

docker-compose.prod.yml

@@ -4,6 +4,9 @@
 # Base images use DaoCloud public mirror (大陆可访问): docker.io → docker.m.daocloud.io
 # See https://github.com/DaoCloud/public-image-mirror
 #
+# The ``api`` service is built from ``Dockerfile``: Debian apt → 阿里云, uv/PyPI → 清华,
+# PyTorch CPU wheels / pytorch.org index files → 南大镜像; see Dockerfile for details.
+#
 # Published API port defaults to 38080 on the host (override with API_PORT).
 #
 # GPU (NVIDIA) inference: uv.lock pins torch/torchvision from the PyTorch *CPU* index (see pyproject.toml).
@@ -30,6 +33,9 @@ services:
     build:
       context: .
       dockerfile: Dockerfile
+      args:
+        # 大陆默认经 DaoCloud；若拉取失败可 export PYTHON_BASE_IMAGE=docker.io/library/python:3.13-slim-bookworm 后 build
+        PYTHON_BASE_IMAGE: ${PYTHON_BASE_IMAGE:-m.daocloud.io/docker.io/library/python:3.13-slim-bookworm}
     environment:
       POSTGRES_USER: ${POSTGRES_USER:-postgres}
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?Set POSTGRES_PASSWORD}