refactor: 统一四个预警历史页面布局结构

- blood-oxygen-alerts.html：更新 stats-card 结构，添加最近预警时间显示
- temperature-alerts.html：完全重构为标准格式，采用与 heart-rate-alerts.html 相同的结构
- stress-alerts.html：已符合标准格式
- 四个页面现采用统一的 stats-card + alert-card 布局，保持各自的颜色主题
- 新增 health-monitor 模块 CHANGELOG.md 文档

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

index.html

@@ -300,11 +300,44 @@ const SITE_MAP = [
     { name:'应用主页', dir:'employee-app/home', entry:'index.html', pages:[
       {n:'应用主页（收起态）',f:'index.html'},
     ] },
-    { name:'健康体检', dir:'employee-app/health-checkup', pages:[] },
+    { name:'健康体检', dir:'employee-app/health-checkup', entry:'index.html', pages:[
+      { file:'index.html', label:'健康体检主页' },
+      { file:'index-inactive.html', label:'健康体检-未开展' },
+      { file:'booking-type.html', label:'选择体检类型' },
+      { file:'booking-hospital.html', label:'预约-选择医院' },
+      { file:'booking-project.html', label:'预约-选择项目' },
+      { file:'booking-project-selected.html', label:'预约-已选项目' },
+      { file:'booking-date.html', label:'预约-选择日期' },
+      { file:'booking-date-selected.html', label:'预约-已选日期' },
+      { file:'my-appointments-detail.html', label:'预约详情' },
+      { file:'my-appointments-detail-done.html', label:'预约详情-已完成' },
+      { file:'my-appointments-detail-cancelled.html', label:'预约详情-已取消' },
+      { file:'my-appointments.html', label:'我的预约-待体检' },
+      { file:'my-appointments-all.html', label:'我的预约-全部' },
+      { file:'my-appointments-done.html', label:'我的预约-已完成' },
+      { file:'my-appointments-cancelled.html', label:'我的预约-已取消' },
+      { file:'hospital-checkin.html', label:'到院体检' },
+      { file:'reports.html', label:'体检报告' },
+      { file:'report-query.html', label:'报告查询详情' },
+      { file:'project-detail.html', label:'体检项目详情' }
+    ] },
     { name:'体重管理', dir:'employee-app/weight-management', pages:[] },
     { name:'营养管理', dir:'employee-app/nutrition', pages:[] },
     { name:'运动管理', dir:'employee-app/exercise', pages:[] },
-    { name:'健康监测', dir:'employee-app/health-monitor', pages:[] },
+    { name:'健康监测', dir:'employee-app/health-monitor', entry:'index.html', pages:[
+      { file:'index.html', label:'健康监测首页' },
+      { file:'steps.html', label:'步数详情' },
+      { file:'sleep.html', label:'睡眠详情' },
+      { file:'heart-rate.html', label:'心率详情' },
+      { file:'heart-rate-alerts.html', label:'心率预警历史' },
+      { file:'temperature.html', label:'体温详情' },
+      { file:'temperature-alerts.html', label:'体温预警历史' },
+      { file:'blood-oxygen.html', label:'血氧详情' },
+      { file:'blood-oxygen-alerts.html', label:'血氧预警历史' },
+      { file:'stress.html', label:'压力详情' },
+      { file:'stress-alerts.html', label:'压力预警历史' },
+      { file:'exercise.html', label:'锻炼详情' }
+    ] },
     { name:'健康评估', dir:'employee-app/health-assessment', pages:[] },
     { name:'心脑血管病预防', dir:'employee-app/cardiovascular', pages:[] },
     { name:'糖尿病预防', dir:'employee-app/diabetes', pages:[] },