fix: 从 versionedImage 提取版本号传给 docker build，绕过 env.SERVICE_VERSION 在 bat GString 中求值为空的问题

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

Jenkinsfile

@@ -81,12 +81,14 @@ pipeline {
               ? '--no-cache'
               : "--build-arg BUILDKIT_INLINE_CACHE=1 --cache-from ${latestImage}"
             def gitCommit = env.GIT_COMMIT ?: 'unknown'
+            // 从 versionedImage 提取版本号（env.SERVICE_VERSION 在 bat GString 中求值为空，本地变量可靠）
+            def svcVersion = versionedImage.split(':').last()
             bat """
               chcp 65001 >nul
               docker login ${env.ACR_REGISTRY} -u ${env.ACR_USERNAME} -p %ACR_PASS%
               if %errorlevel% neq 0 exit /b 1
               docker pull --platform=linux/amd64 ${latestImage} || echo Pull failed, will build fresh
-              docker build --platform=linux/amd64 -f ${env.DOCKERFILE} ${env.BUILD_ARGS} --build-arg GIT_COMMIT=${gitCommit} --build-arg SERVICE_VERSION=%SERVICE_VERSION% ${cacheArgs} -t ${versionedImage} -t ${latestImage} .
+              docker build --platform=linux/amd64 -f ${env.DOCKERFILE} ${env.BUILD_ARGS} --build-arg GIT_COMMIT=${gitCommit} --build-arg SERVICE_VERSION=${svcVersion} ${cacheArgs} -t ${versionedImage} -t ${latestImage} .
               if %errorlevel% neq 0 exit /b 1
               docker push ${versionedImage}
               if %errorlevel% neq 0 exit /b 1