test(hooks): finalize mutation test improvements and release acceptance

- Raise use-swipe-gesture mutation score to 66.13% (target 65%+)
- Maintain use-reduced-motion mutation score at 76.32% (target 50%+)
- Fix use-reduced-motion.ts ESLint set-state-in-effect warning
- Add UJ-10 deep searcher journey (category browse → article read → content discovery)
- Add 40 new test files (analytics, detail, sections, ui, lib components)
- Update test-strategy-plan.md to v2.0 (sync test count to 1591)
- Sync README.md with final release metrics

Quality gates: TS 0 errors, ESLint 0 errors, 121 suites / 1591 tests passed

Jenkinsfile

@@ -472,6 +472,49 @@ pipeline {
 
         failure {
             echo "❌ Pipeline 执行失败！请查看日志。"
+
+            script {
+                // 邮件通知（使用 Jenkins 内置 mail step，无需额外插件）
+                try {
+                    mail(
+                        to: 'team@novalon.cn',
+                        subject: "[FAILED] ${env.JOB_NAME} - #${env.BUILD_NUMBER}",
+                        body: """
+                            Pipeline 执行失败！
+                            项目: ${env.JOB_NAME}
+                            构建号: #${env.BUILD_NUMBER}
+                            分支: ${env.BRANCH_NAME}
+                            提交: ${env.GIT_COMMIT}
+                            详情: ${env.BUILD_URL}console
+                            日志: ${env.BUILD_URL}
+                        """
+                    )
+                    echo "📧 邮件通知已发送至 team@novalon.cn"
+                } catch (Exception e) {
+                    echo "⚠️ 邮件通知发送失败（mail plugin 可能未配置）: ${e.getMessage()}"
+                }
+
+                // Webhook 通知（预留，可接入钉钉/企业微信/Gitee Webhook）
+                try {
+                    def webhookUrl = env.WEBHOOK_NOTIFICATION_URL ?: ''
+                    if (webhookUrl) {
+                        sh """
+                            curl -s -X POST '${webhookUrl}' \
+                                -H 'Content-Type: application/json' \
+                                -d '{
+                                    "msgtype": "markdown",
+                                    "markdown": {
+                                        "title": "❌ Pipeline 失败: ${env.JOB_NAME}",
+                                        "text": "### ❌ Pipeline 执行失败\\n\\n**项目**: ${env.JOB_NAME}\\n**构建号**: #${env.BUILD_NUMBER}\\n**分支**: ${env.BRANCH_NAME}\\n**详情**: [查看日志](${env.BUILD_URL}console)"
+                                    }
+                                }' || true
+                        """
+                        echo "🔔 Webhook 通知已发送"
+                    }
+                } catch (Exception e) {
+                    echo "⚠️ Webhook 通知发送失败: ${e.getMessage()}"
+                }
+            }
         }
     }
 }