fix(identity-service): 恢复使用 npmmirror 镜像

- 从华为云镜像回滚到 npmmirror
- 移除无效的 disturl 配置

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

backend/services/identity-service/Dockerfile

@@ -8,10 +8,8 @@ FROM node:20-alpine AS builder
 # Use Aliyun mirror for Alpine packages (China acceleration)
 RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
 
-# Use China mirrors for npm (try Huawei mirror as fallback)
-# Options: npmmirror.com, mirrors.huaweicloud.com, registry.npm.taobao.org
-RUN npm config set registry https://mirrors.huaweicloud.com/repository/npm/ && \
-    npm config set disturl https://mirrors.huaweicloud.com/nodejs/
+# Use taobao npm registry (China acceleration)
+RUN npm config set registry https://registry.npmmirror.com
 
 WORKDIR /app
 
@@ -53,8 +51,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     curl \
     && rm -rf /var/lib/apt/lists/*
 
-# Use Huawei npm mirror (more stable than npmmirror)
-RUN npm config set registry https://mirrors.huaweicloud.com/repository/npm/
+# Use taobao npm registry (China acceleration)
+RUN npm config set registry https://registry.npmmirror.com
 
 # Install production dependencies only
 COPY package*.json ./