Added Jenkinsfile.

Jenkinsfile

@@ -0,0 +1,25 @@
+def deploy() {
+    node('ubuntu') {
+        try {
+            stage('Deploy (Ubuntu)') {
+                checkout scm
+
+                nodejs(nodeJSInstallationName: 'Node23') {
+                    sh 'yarn install --frozen-lockfile --production=false'
+
+                    sh 'NODE_ENV=production yarn build'
+
+                    // Deploy to Cloudflare Pages using wrangler
+                    withCredentials([string(credentialsId: 'th-cloudflare-api-token', variable: 'CLOUDFLARE_API_TOKEN')]) {
+                        sh 'yarn wrangler pages deploy dist'
+                    }
+                }
+            }
+        } finally {
+            cleanWs()
+        }
+    }
+}
+
+deploy()
+