Add China mirror sources to frontend Dockerfile

Use Aliyun Alpine mirrors and npmmirror.com npm registry
for faster builds on mainland China servers.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/Dockerfile

@@ -1,12 +1,18 @@
 # Build stage
 FROM node:20-alpine AS builder
 
+# Use Aliyun mirrors for Alpine packages
+RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
+
 WORKDIR /app
 
 # 构建参数（NEXT_PUBLIC_* 变量需要在构建时注入）
 ARG NEXT_PUBLIC_API_BASE
 ENV NEXT_PUBLIC_API_BASE=${NEXT_PUBLIC_API_BASE}
 
+# Use China npm mirror
+RUN npm config set registry https://registry.npmmirror.com
+
 # Copy package files
 COPY package*.json ./
 
@@ -25,6 +31,9 @@ RUN npm run build
 # Production stage
 FROM node:20-alpine AS runner
 
+# Use Aliyun mirrors for Alpine packages
+RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
+
 WORKDIR /app
 
 ENV NODE_ENV=production