feat: 三端抽屉重构 + 配色系统更新 + 后台管理页精调 + 键盘抬起组件

## 抽屉重构
- admin_drawer / doctor_drawer / health_drawer 三端抽屉全部重做
- drawer_shell 增强

## 配色系统
- app_colors / app_module_visuals / app_theme 更新
- app.dart 启动流程调整

## 后台管理页
- admin_doctors_page 大幅重构(+251)
- admin_home / doctor_dashboard / doctor_reports / doctor_home / doctor_followups / doctor_settings 精调

## 患者端
- home_page / chat_messages_view / medication_list / notification_center / remaining_pages / exercise_plan / device / diet / consultation 微调

## 新增
- keyboard_lift.dart: 键盘抬起处理组件
- AGENTS.md: agent 指引文档

## 其他
- api_client IP 适配
- app_future_view 增强
- data_providers 调整
- secondary_page_visuals_test 更新

health_app/lib/pages/device/device_scan_page.dart

@@ -445,12 +445,12 @@ class _DeviceResultTile extends StatelessWidget {
             width: 42,
             height: 42,
             decoration: BoxDecoration(
-              color: AppColors.deviceLight,
+              color: AppColors.device,
               borderRadius: AppRadius.smBorder,
             ),
             child: Icon(
               type?.icon ?? Icons.bluetooth_rounded,
-              color: AppColors.device,
+              color: Colors.white,
               size: 25,
             ),
           ),
@@ -565,14 +565,13 @@ class _ScanPulse extends StatelessWidget {
           width: 64,
           height: 64,
           decoration: BoxDecoration(
-            color: Colors.white,
+            color: AppColors.device,
             borderRadius: AppRadius.xlBorder,
-            border: Border.all(color: AppColors.borderLight),
           ),
           child: const Icon(
             Icons.bluetooth_searching_rounded,
             size: 32,
-            color: AppColors.device,
+            color: Colors.white,
           ),
         ),
       ],