ci:Jenkinsfile Slack 알림 추가 (slackSend #product_infra)

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

Jenkinsfile

@@ -87,9 +87,13 @@ pipeline {
     }
 
     post {
-        success { echo "✅ api 배포 완료 (${env.BRANCH_NAME})" }
+        success {
+            slackSend channel: '#product_infra', color: 'good',
+                message: "✅ *api* 배포 성공 (`${env.BRANCH_NAME}`)\n<${env.BUILD_URL}|빌드 #${env.BUILD_NUMBER}>"
+        }
         failure {
-            echo "❌ api 배포 실패 (${env.BRANCH_NAME})"
+            slackSend channel: '#product_infra', color: 'danger',
+                message: "❌ *api* 배포 실패 (`${env.BRANCH_NAME}`)\n<${env.BUILD_URL}|빌드 #${env.BUILD_NUMBER}>"
             script {
                 if (env.BRANCH_NAME == 'main') {
                     sshagent(credentials: ['deploy-ssh-key']) {