Update registry to registry.667788.cool and add build scripts

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy/docker/backend.Dockerfile

@@ -1,6 +1,8 @@
 # 生产环境 Backend Dockerfile
 # 用途：构建优化的生产镜像
-FROM python:3.12-slim AS builder
+# 支持通过构建参数指定基础镜像（默认使用官方镜像）
+ARG PYTHON_IMAGE=python:3.12-slim
+FROM ${PYTHON_IMAGE} AS builder
 
 WORKDIR /app
 
@@ -16,7 +18,8 @@ COPY backend/requirements.txt .
 RUN pip install --no-cache-dir --user -r requirements.txt
 
 # 生产镜像
-FROM python:3.12-slim
+ARG PYTHON_IMAGE=python:3.12-slim
+FROM ${PYTHON_IMAGE}
 
 WORKDIR /app