feat: 冗余存储三方平台信息，兼容旧版本逻辑

uni_modules/uni-id-pages/uniCloud/cloudfunctions/uni-id-co/lib/utils/qq.js

@@ -46,7 +46,8 @@ function generateQQCache ({
   }
   return {
     third_party: {
-      [`${appId}_${platform}_qq`]: cache
+      [`${appId}_${platform}_qq`]: cache,
+      [`${platform}_qq`]: cache
     }
   }
 }

uni_modules/uni-id-pages/uniCloud/cloudfunctions/uni-id-co/lib/utils/weixin.js

@@ -85,7 +85,8 @@ function generateWeixinCache ({
   }
   return {
     third_party: {
-      [`${appId}_${platform}_weixin`]: cache
+      [`${appId}_${platform}_weixin`]: cache,
+      [`${platform}_weixin`]: cache
     }
   }
 }