improve: use alibaba mirror for maven and npmmirror for pnpm

Dockerfile

@@ -3,12 +3,22 @@
 # 构建：docker build -t lab-backend .
 # 运行：docker run -p 8080:8080 -e SPRING_PROFILES_ACTIVE=mariadb \
 #         -e DB_HOST=host.docker.internal -e DB_USER=lab -e DB_PASSWORD=lab123456 lab-backend
+#
+# 国内加速：构建阶段使用阿里云 Maven 镜像（docker/maven-settings.xml）
+# 如需走官方中央仓库：docker build --build-arg MAVEN_MIRROR=false -t lab-backend .
 # =====================================================================
 
 # ---------- 构建阶段 ----------
-FROM docker.io/library/maven:3.9-eclipse-temurin-21 AS build
+FROM maven:3.9-eclipse-temurin-21 AS build
 WORKDIR /build
 
+# MAVEN_MIRROR=false 时跳过阿里云镜像配置，使用默认中央仓库
+ARG MAVEN_MIRROR=true
+COPY docker/maven-settings.xml /tmp/maven-settings.xml
+RUN if [ "$MAVEN_MIRROR" = "true" ]; then \
+      mkdir -p /root/.m2 && cp /tmp/maven-settings.xml /root/.m2/settings.xml; \
+    fi
+
 # 先只复制 pom，利用 Docker 层缓存预热依赖
 COPY pom.xml .
 RUN mvn -B -q -Dmaven.test.skip=true dependency:go-offline
@@ -19,7 +29,7 @@ RUN mvn -B -q -Dmaven.test.skip=true package \
     && cp target/*.jar /build/app.jar
 
 # ---------- 运行阶段 ----------
-FROM docker.io/library/eclipse-temurin:21-jre
+FROM eclipse-temurin:21-jre
 WORKDIR /opt/app
 
 # 以非 root 用户运行