fix: use China mirrors for pip and npm in Dockerfiles

deploy/Dockerfile.backend

@@ -2,9 +2,9 @@ FROM python:3.11-slim
 
 WORKDIR /app
 
-# 安装依赖
+# 安装依赖（使用阿里云镜像）
 COPY backend/requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
+RUN pip install --no-cache-dir -i https://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com -r requirements.txt
 
 # 复制代码
 COPY backend/app ./app

deploy/Dockerfile.frontend

@@ -2,9 +2,9 @@ FROM node:20-alpine as builder
 
 WORKDIR /app
 
-# 安装依赖
+# 安装依赖（使用淘宝镜像）
 COPY frontend/package*.json ./
-RUN npm ci
+RUN npm config set registry https://registry.npmmirror.com && npm ci
 
 # 构建
 COPY frontend/ .