chore: 增加 gist 错误日志

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "sub-store",
-  "version": "2.14.258",
+  "version": "2.14.260",
   "description": "Advanced Subscription Manager for QX, Loon, Surge, Stash and ShadowRocket.",
   "main": "src/main.js",
   "scripts": {

backend/src/restful/miscs.js

@@ -153,11 +153,14 @@ async function gistBackup(req, res) {
             }
             success(res);
         } catch (err) {
+            $.error(
+                `Failed to ${action} gist data.\nReason: ${err.message ?? err}`,
+            );
             failed(
                 res,
                 new InternalServerError(
                     'BACKUP_FAILED',
-                    `Failed to ${action} data to gist!`,
+                    `Failed to ${action} gist data!`,
                     `Reason: ${err.message ?? err}`,
                 ),
             );