回答题目增加正确答案

src/api/controllers/puzzle.controller.ts

@@ -95,6 +95,6 @@ class PuzzleController extends BaseController {
     history.status = 1
     history.markModified('members')
     await history.save()
-    return { result, stats: history.members }
+    return { result, answer: record.a1, stats: history.members }
   }
 }