fix: 侧边栏新增功能入口（报告/日历/饮食/复查）

健康概览和历史对话之间增加：
- 报告管理 → reports 路由
- 健康日历 → calendar 路由
- 饮食记录 → dietRecords 路由
- 复查随访 → followups 路由

health_app/lib/widgets/health_drawer.dart

@@ -66,6 +66,15 @@ class HealthDrawer extends ConsumerWidget {
               ]),
             ),
 
+            const Divider(),
+            Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 8),
+              child: Text('功能', style: Theme.of(context).textTheme.labelMedium!.copyWith(fontWeight: FontWeight.w600)),
+            ),
+            _DrawerItem(icon: Icons.description, label: '报告管理', onTap: () => pushRoute(ref, 'reports')),
+            _DrawerItem(icon: Icons.calendar_today, label: '健康日历', onTap: () => pushRoute(ref, 'calendar')),
+            _DrawerItem(icon: Icons.restaurant, label: '饮食记录', onTap: () => pushRoute(ref, 'dietRecords')),
+            _DrawerItem(icon: Icons.event_note, label: '复查随访', onTap: () => pushRoute(ref, 'followups')),
             const Divider(),
             Padding(
               padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 8),