update prod env

docker-compose.prod.yml

@@ -1,7 +1,7 @@
 # Production stack for the current codebase: FastAPI + PostgreSQL.
 # The API hard-fails on startup if the database is not reachable, so DB health is required.
 #
-# Base images use DaoCloud public mirror (大陆可访问): docker.io → docker.m.daocloud.io
+# Base images: DaoCloud「增加前缀」镜像（README 推荐，减少 BuildKit 直连 registry-1.docker.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,
@@ -14,7 +14,7 @@
 # and assign GPUs to the api service (deploy.resources.reservations.devices).
 services:
   db:
-    image: docker.m.daocloud.io/library/postgres:16-alpine
+    image: m.daocloud.io/docker.io/library/postgres:16-alpine
     environment:
       POSTGRES_USER: ${POSTGRES_USER:-postgres}
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?Set POSTGRES_PASSWORD}
@@ -33,10 +33,6 @@ services:
     build:
       context: .
       dockerfile: Dockerfile
-      args:
-        # 与 db 服务一致：docker.m.daocloud.io/library/...（勿用 bare tag 3.13，镜像站常解析失败）
-        # 需直连 Docker Hub 时可 export PYTHON_BASE_IMAGE=docker.io/library/python:3.13-slim-bookworm
-        PYTHON_BASE_IMAGE: ${PYTHON_BASE_IMAGE:-docker.m.daocloud.io/library/python:3.13-slim-bookworm}
     environment:
       POSTGRES_USER: ${POSTGRES_USER:-postgres}
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?Set POSTGRES_PASSWORD}