fix: 管理员系统 + 注册流程重构 + UI改版 + 全链路修复

- 新增管理员角色(手机号12345678910)，管理员可增删医生、查看患者
- 注册页重构：去掉角色选择+审核码，改为选医生+填姓名
- 医生端点按DoctorId过滤患者，Patient↔Doctor关系建立
- Doctor/DoctorProfile/User实体新增关联字段
- JSON循环引用修复(IgnoreCycles)
- /api/doctors改为公开接口
- 登录闪屏修复+原生Android启动页
- 输入框全局白底+灰框
- 蓝牙重连同步修复
- Web端(doctor_web+health_app/web)全部删除
- 全局UI改版：白底企业风，新配色和组件系统
- 新品牌图标和启动图

health_app/lib/widgets/app_card.dart

@@ -1,8 +1,7 @@
 import 'package:flutter/material.dart';
-import 'package:shadcn_ui/shadcn_ui.dart';
+import '../core/app_colors.dart';
 import '../core/app_theme.dart';
 
-/// 统一样式的清新卡片
 class AppCard extends StatelessWidget {
   final Widget child;
   final EdgeInsetsGeometry? padding;
@@ -10,6 +9,7 @@ class AppCard extends StatelessWidget {
   final VoidCallback? onTap;
   final Color? backgroundColor;
   final BorderRadius? borderRadius;
+  final Border? border;
 
   const AppCard({
     super.key,
@@ -19,28 +19,30 @@ class AppCard extends StatelessWidget {
     this.onTap,
     this.backgroundColor,
     this.borderRadius,
+    this.border,
   });
 
   @override
   Widget build(BuildContext context) {
-    final theme = ShadTheme.of(context);
+    final radius = borderRadius ?? BorderRadius.circular(AppTheme.rLg);
     final card = Container(
-      margin: margin ?? const EdgeInsets.symmetric(horizontal: AppTheme.sLg, vertical: AppTheme.sSm),
+      margin:
+          margin ??
+          const EdgeInsets.symmetric(
+            horizontal: AppTheme.sLg,
+            vertical: AppTheme.sSm,
+          ),
       padding: padding,
       decoration: BoxDecoration(
-        color: backgroundColor ?? theme.colorScheme.card,
-        borderRadius: borderRadius ?? BorderRadius.circular(AppTheme.rMd),
-        boxShadow: [AppTheme.shadowLight],
+        color: backgroundColor ?? AppColors.cardBackground,
+        borderRadius: radius,
+        border: border ?? Border.all(color: AppColors.border),
+        boxShadow: AppColors.cardShadowLight,
       ),
       child: child,
     );
 
-    if (onTap != null) {
-      return GestureDetector(
-        onTap: onTap,
-        child: card,
-      );
-    }
-    return card;
+    if (onTap == null) return card;
+    return InkWell(onTap: onTap, borderRadius: radius, child: card);
   }
 }