fix: Fix Jenkinsfile syntax errors and optimize for pre-installed Buildx

Fixes:
-  Fix missing indentation on line 127 (catch block)
-  Fix stage indentation issues
-  Remove automatic Buildx installation since it's pre-installed on server

Optimizations:
-  Use existing Docker Buildx v0.25.0 installation
-  Preserve buildx builder instance across builds for better performance
-  Improved builder instance lifecycle management
-  Better error handling and logging

The pipeline should now parse correctly and utilize the manually installed Buildx.

Jenkinsfile

@@ -121,9 +121,9 @@ pipeline {
                                 -Dsonar.login=${SONAR_TOKEN} \
                                 -Dsonar.coverage.jacoco.xmlReportPaths=target/site/jacoco/jacoco.xml
                         """
-                        
-                        echo "✅ SonarQube代码扫描完成"
-                    } catch (Exception e) {                        echo "⚠️ SonarQube扫描失败，继续构建流程: ${e.getMessage()}"
+                          echo "✅ SonarQube代码扫描完成"
+                    } catch (Exception e) {
+                        echo "⚠️ SonarQube扫描失败，继续构建流程: ${e.getMessage()}"
                     }
                 }
             }
@@ -156,21 +156,18 @@ pipeline {
                             sh 'docker image prune -f || true'
                             
                             echo "开始构建Docker镜像: ${IMAGE_NAME}:${IMAGE_TAG}"
-                            
-                            // 启用Docker Buildx并创建构建器
+                              // 启用Docker Buildx并创建构建器
                             sh '''
-                                # 检查并安装buildx（如果需要）
-                                if ! docker buildx version; then
-                                    echo "Installing Docker Buildx..."
-                                    DOCKER_BUILDX_VERSION=v0.12.1
-                                    curl -L https://github.com/docker/buildx/releases/download/${DOCKER_BUILDX_VERSION}/buildx-${DOCKER_BUILDX_VERSION}.linux-amd64 -o docker-buildx
-                                    chmod +x docker-buildx
-                                    mkdir -p ~/.docker/cli-plugins
-                                    mv docker-buildx ~/.docker/cli-plugins/
-                                fi
+                                echo "✅ 使用已安装的 Docker Buildx $(docker buildx version)"
                                 
-                                # 创建并使用新的构建器实例
-                                docker buildx create --name jenkins-builder --use --bootstrap || docker buildx use jenkins-builder
+                                # 创建并使用新的构建器实例（如果不存在）
+                                if ! docker buildx inspect jenkins-builder >/dev/null 2>&1; then
+                                    echo "创建新的构建器实例..."
+                                    docker buildx create --name jenkins-builder --use --bootstrap
+                                else
+                                    echo "使用现有构建器实例..."
+                                    docker buildx use jenkins-builder
+                                fi
                                 
                                 # 验证构建器状态
                                 docker buildx inspect --bootstrap
@@ -423,14 +420,13 @@ EOF
                 echo message
             }
         }
-        
-        unstable {
+          unstable {
             echo '⚠️ 构建不稳定，可能存在测试失败'
         }
-          cleanup {
+        
+        cleanup {
             script {
-                try {
-                    // 清理Docker构建缓存（防止磁盘空间不足）
+                try {                    // 清理Docker构建缓存（防止磁盘空间不足）
                     sh '''
                         # 清理buildx缓存
                         rm -rf /tmp/.buildx-cache* || true
@@ -438,8 +434,8 @@ EOF
                         # 清理未使用的Docker资源
                         docker system prune -f || true
                         
-                        # 移除构建器（如果存在）
-                        docker buildx rm jenkins-builder || true
+                        # 保留构建器实例以提高后续构建速度
+                        echo "保留构建器实例jenkins-builder以优化后续构建"
                     '''
                     
                     // 清理工作空间