feat(miniprogram): add local QR temp-file helper via uqrcodejs.

Co-authored-by: Cursor <cursoragent@cursor.com>

miniprogram/package-lock.json

@@ -11,6 +11,7 @@
       "dependencies": {
         "@vant/weapp": "^1.11.7",
         "jsencrypt": "^3.5.4",
+        "uqrcodejs": "^4.0.7",
         "vant": "^4.9.0"
       },
       "engines": {
@@ -313,6 +314,12 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/uqrcodejs": {
+      "version": "4.0.7",
+      "resolved": "https://registry.npmmirror.com/uqrcodejs/-/uqrcodejs-4.0.7.tgz",
+      "integrity": "sha512-84+aZmD2godCVI+93lxE3YUAPNY8zAJvNA7xRS7R7U+q57KzMDepBSfNCwoRUhWOfR6eHFoAOcHRPwsP6ka1cA==",
+      "license": "Apache-2.0"
+    },
     "node_modules/vant": {
       "version": "4.9.24",
       "resolved": "https://registry.npmmirror.com/vant/-/vant-4.9.24.tgz",