ci: add Jenkinsfile for CI/CD pipeline

Jenkinsfile

@@ -0,0 +1,32 @@
+pipeline {
+    agent any
+    environment {
+        STATIC = '/var/www/manager'
+        NOTIFY = "${ITSM_BASE_URL}/api/messenger/webhook"
+    }
+    options { buildDiscarder(logRotator(numToKeepStr: '5')); timeout(time: 15, unit: 'MINUTES') }
+    stages {
+        stage('Checkout') { steps { checkout scm } }
+        stage('Build') {
+            steps {
+                dir('frontend') {
+                    sh 'npm ci 2>/dev/null || npm install'
+                    sh 'npm run build'
+                }
+            }
+        }
+        stage('Deploy') {
+            when { branch 'main' }
+            steps {
+                sh """
+                    cp -r frontend/dist/. ${STATIC}/
+                    systemctl restart guardia-manager 2>/dev/null || true
+                """
+            }
+        }
+    }
+    post {
+        success { sh "curl -sf -X POST ${NOTIFY} -H 'Content-Type:application/json' -d '{\"event\":\"build_result\",\"room\":\"ops\",\"success\":true,\"result_summary\":\"✅ guardia-manager 배포 완료\"}' 2>/dev/null || true" }
+        failure { sh "curl -sf -X POST ${NOTIFY} -H 'Content-Type:application/json' -d '{\"event\":\"build_result\",\"room\":\"ops\",\"success\":false,\"result_summary\":\"❌ guardia-manager 빌드 실패\"}' 2>/dev/null || true" }
+    }
+}