chore: [infra] Slack 알림 채널 분리 — product_infra → deploy_mng

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

Jenkinsfile

@@ -8,7 +8,7 @@ pipeline {
     stages {
         stage('Checkout') {
             steps {
-                slackSend channel: '#product_infra', color: '#439FE0',
+                slackSend channel: '#deploy_mng', color: '#439FE0',
                     message: "🚀 *sales* 빌드 시작 (`${env.BRANCH_NAME}`)\n<${env.BUILD_URL}|빌드 #${env.BUILD_NUMBER}>"
                 checkout scm
             }
@@ -35,11 +35,11 @@ pipeline {
 
     post {
         success {
-            slackSend channel: '#product_infra', color: 'good',
+            slackSend channel: '#deploy_mng', color: 'good',
                 message: "✅ *sales* 배포 성공 (`${env.BRANCH_NAME}`)\n<${env.BUILD_URL}|빌드 #${env.BUILD_NUMBER}>"
         }
         failure {
-            slackSend channel: '#product_infra', color: 'danger',
+            slackSend channel: '#deploy_mng', color: 'danger',
                 message: "❌ *sales* 배포 실패 (`${env.BRANCH_NAME}`)\n<${env.BUILD_URL}|빌드 #${env.BUILD_NUMBER}>"
         }
     }