feat: 健康录入提醒 + 多指标异常 + 用药漏服 + UI 优化

后端
- NotificationPreference 增加健康录入提醒总开关和 5 子项（血压/心率/血糖/血氧/体重）
- EF 迁移 AddHealthRecordReminder
- 新增 GET/PUT /api/notification-prefs
- 新增 HealthRecordReminderService 每天 9 点/12 点扫描未录入用户推送提醒

前端
- 通知偏好对接真实后端 API
- 设置页新增「健康录入提醒」总开关+5 子项
- 通知中心右上角加齿轮跳设置页
- 今日健康卡片：4 项异常检测+多项合并；用药只显漏服并按时间窗口区分文案
- 侧边栏头像改圆形白底灰图标，去掉紫色品牌渐变
- 整体背景统一浅灰白 #F6F8FC，去掉浅紫渐变
- 设置页简化（去掉分组/彩色图标方块）
- 健康档案保存按钮移到右上角，TextButton 全局默认黑色
- API baseUrl 跟随网络环境

health_app/lib/pages/remaining_pages.dart

@@ -727,9 +727,7 @@ class _ExercisePlanPageState extends ConsumerState<ExercisePlanPage> {
         backgroundColor: AppTheme.primary,
         child: const Icon(Icons.add),
       ),
-      body: Container(
-        decoration: const BoxDecoration(gradient: AppColors.bgGradient),
-        child: AppFutureView<List<Map<String, dynamic>>>(
+      body: AppFutureView<List<Map<String, dynamic>>>(
           future: _future,
           onRetry: _load,
           errorTitle: '运动计划加载失败',
@@ -770,7 +768,7 @@ class _ExercisePlanPageState extends ConsumerState<ExercisePlanPage> {
                     decoration: BoxDecoration(
                       color: Colors.white,
                       borderRadius: BorderRadius.circular(AppTheme.rMd),
-                      border: Border.all(color: const Color(0xFFE8ECF0)),
+                      border: Border.all(color: const Color(0xFFCFD6E0), width: 1.2),
                       boxShadow: [AppTheme.shadowLight],
                     ),
                     child: Row(
@@ -854,7 +852,6 @@ class _ExercisePlanPageState extends ConsumerState<ExercisePlanPage> {
             );
           },
         ),
-      ),
     );
   }
 }
@@ -1399,7 +1396,7 @@ class _HealthArchivePageState extends ConsumerState<HealthArchivePage> {
   Widget build(BuildContext context) {
     if (_loading) {
       return Scaffold(
-        backgroundColor: Colors.white,
+        backgroundColor: const Color(0xFFF6F8FC),
         appBar: AppBar(
           backgroundColor: Colors.white,
           elevation: 0,
@@ -1417,7 +1414,7 @@ class _HealthArchivePageState extends ConsumerState<HealthArchivePage> {
       );
     }
     return Scaffold(
-      backgroundColor: Colors.white,
+      backgroundColor: const Color(0xFFF6F8FC),
       appBar: AppBar(
         backgroundColor: Colors.white,
         elevation: 0,
@@ -1442,6 +1439,7 @@ class _HealthArchivePageState extends ConsumerState<HealthArchivePage> {
                 )
               : TextButton(
                   onPressed: _save,
+                  style: TextButton.styleFrom(foregroundColor: AppColors.textPrimary),
                   child: const Text('保存', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600)),
                 ),
         ],
@@ -1550,8 +1548,14 @@ class _Section extends StatelessWidget {
     decoration: BoxDecoration(
       color: Colors.white,
       borderRadius: BorderRadius.circular(14),
-      border: Border.all(color: AppColors.border),
-      boxShadow: AppColors.cardShadowLight,
+      border: Border.all(color: const Color(0xFFD5DCE5)),
+      boxShadow: [
+        BoxShadow(
+          color: const Color(0xFF101828).withValues(alpha: 0.08),
+          blurRadius: 18,
+          offset: const Offset(0, 6),
+        ),
+      ],
     ),
     child: Column(
       crossAxisAlignment: CrossAxisAlignment.start,