fix: 欢迎卡片UI优化 + 蓝牙录入按钮 + 多处修复

- 欢迎卡片：去掉白框圆角错位、图片满宽、按钮去箭头改圆角居中
- 渐变actionOutlineGradient改紫蓝双色循环
- 新增健康Agent"蓝牙录入"按钮→蓝牙设备页
- "查看健康情况"改名"健康概览"
- 饮食编辑框删除bug修复(控制器缓存)
- 启动脚本加adb reverse自动转发
- 登录闪屏修复

health_app/lib/widgets/app_menu_item.dart

@@ -24,11 +24,11 @@ class AppMenuItem extends StatelessWidget {
       behavior: HitTestBehavior.opaque,
       child: Container(
         margin: const EdgeInsets.symmetric(horizontal: 20, vertical: 5),
-        padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 13),
+        padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 12),
         decoration: BoxDecoration(
-          color: Colors.white,
-          borderRadius: BorderRadius.circular(16),
-          border: Border.all(color: AppColors.border),
+          gradient: AppColors.surfaceGradient,
+          borderRadius: BorderRadius.circular(14),
+          border: Border.all(color: AppColors.borderLight),
           boxShadow: AppColors.cardShadowLight,
         ),
         child: Row(
@@ -37,10 +37,14 @@ class AppMenuItem extends StatelessWidget {
               width: 40,
               height: 40,
               decoration: BoxDecoration(
-                color: AppColors.iconBg,
-                borderRadius: BorderRadius.circular(12),
+                gradient: LinearGradient(
+                  begin: Alignment.topLeft,
+                  end: Alignment.bottomRight,
+                  colors: [AppColors.primaryLight, AppColors.infoLight],
+                ),
+                borderRadius: BorderRadius.circular(13),
               ),
-              child: Icon(icon, size: 21, color: AppColors.primary),
+              child: Icon(icon, size: 20, color: AppColors.primaryDark),
             ),
             const SizedBox(width: 14),
             Expanded(