feat: 旅游卡页面重设计 + uni-app升级 + Sass迁移@use

- 旅游卡页面(qrcode/index): 卡面背景图、持卡人信息直接显示、
  头像点击查看大图、绑定入口、入园码二维码、卡号复制按钮
- App.vue: getSystemInfoSync → getDeviceInfo, try/catch兜底
- uni-app 升级到 3.0.0-alpha-5010320260611001 (5.13)
- Sass: @import → @use 迁移(main.scss, _mixins.scss, _utilities.scss)
- pnpm-workspace.yaml 配置更新

Co-Authored-By: Claude <noreply@anthropic.com>

src/styles/_mixins.scss

@@ -1,6 +1,7 @@
 // ============================================
 // SCSS Mixins
 // ============================================
+@use 'tokens' as *;
 
 // === FLEX ===
 

src/styles/_utilities.scss

@@ -1,6 +1,7 @@
 // ============================================
 // Utility Classes
 // ============================================
+@use 'tokens' as *;
 
 // === TEXT SIZE ===
 

src/styles/main.scss

@@ -4,10 +4,10 @@
 // Imported globally via App.vue <style lang="scss">
 // Token variables are separately injected via uni.scss
 
-@import 'tokens';
-@import 'mixins';
-@import 'animations';
-@import 'utilities';
+@use 'tokens' as *;
+@use 'mixins' as *;
+@use 'animations' as *;
+@use 'utilities' as *;
 
 // === GLOBAL BASE ===