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/widgets/drawer_shell.dart

@@ -1,5 +1,44 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 
+Future<void> runAfterDrawerClose(
+  BuildContext context,
+  FutureOr<void> Function() action,
+) async {
+  Navigator.of(context).pop();
+  await action();
+}
+
+Future<bool> confirmAccountAction(
+  BuildContext context, {
+  required String title,
+  required String message,
+  required String confirmLabel,
+}) async {
+  return await showDialog<bool>(
+        context: context,
+        builder: (dialogContext) => AlertDialog(
+          title: Text(title),
+          content: Text(message),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(dialogContext, false),
+              child: const Text('取消'),
+            ),
+            TextButton(
+              onPressed: () => Navigator.pop(dialogContext, true),
+              child: Text(
+                confirmLabel,
+                style: const TextStyle(color: Colors.red),
+              ),
+            ),
+          ],
+        ),
+      ) ??
+      false;
+}
+
 class DrawerShell extends StatelessWidget {
   final double widthFactor;
   final Widget child;